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Iran–Iraq relations (; ) are the diplomatic and
foreign relations Foreign policy, also known as external policy, is the set of strategies and actions a State (polity), state employs in its interactions with other states, unions, and international entities. It encompasses a wide range of objectives, includ ...
between the two
sovereign states A sovereign state is a State (polity), state that has the highest authority over a territory. It is commonly understood that Sovereignty#Sovereignty and independence, a sovereign state is independent. When referring to a specific polity, the ter ...
of
Iran Iran, officially the Islamic Republic of Iran (IRI) and also known as Persia, is a country in West Asia. It borders Iraq to the west, Turkey, Azerbaijan, and Armenia to the northwest, the Caspian Sea to the north, Turkmenistan to the nort ...
and
Iraq Iraq, officially the Republic of Iraq, is a country in West Asia. It is bordered by Saudi Arabia to Iraq–Saudi Arabia border, the south, Turkey to Iraq–Turkey border, the north, Iran to Iran–Iraq border, the east, the Persian Gulf and ...
. Both states have history that extends for
millennia A millennium () is a period of one thousand years, one hundred decades, or ten centuries, sometimes called a kiloannum (ka), or kiloyear (ky). Normally, the word is used specifically for periods of a thousand years that begin at the starting p ...
into the past.
Iran Iran, officially the Islamic Republic of Iran (IRI) and also known as Persia, is a country in West Asia. It borders Iraq to the west, Turkey, Azerbaijan, and Armenia to the northwest, the Caspian Sea to the north, Turkmenistan to the nort ...
and
Iraq Iraq, officially the Republic of Iraq, is a country in West Asia. It is bordered by Saudi Arabia to Iraq–Saudi Arabia border, the south, Turkey to Iraq–Turkey border, the north, Iran to Iran–Iraq border, the east, the Persian Gulf and ...
share a long border (the longest border for both nations) and an ancient cultural and religious heritage. In ancient times Iraq formed part of the core of
Persia Iran, officially the Islamic Republic of Iran (IRI) and also known as Persia, is a country in West Asia. It borders Iraq to the west, Turkey, Azerbaijan, and Armenia to the northwest, the Caspian Sea to the north, Turkmenistan to the nort ...
(modern-day Iran) for about a thousand years. Modern relations between the two nations turned increasingly negative following the
14 July Revolution The 14 July Revolution, also known as the 1958 Iraqi military coup, was a ''coup d'état'' that took place on 14 July 1958 in Iraq, resulting in the toppling of King Faisal II and the overthrow of the Hashemite-led Kingdom of Iraq. The Ira ...
in Iraq in 1958, and subsequent overthrow of the Hashemite Monarchy which resulted in the country withdrawing from the Baghdad Pact. The
Ba'ath Party The Arab Socialist Ba'ath Party ( ' ), also known simply as Bath Party (), was a political party founded in Syria by Michel Aflaq, Salah al-Din al-Bitar, and associates of Zaki al-Arsuzi. The party espoused Ba'athism, which is an ideology ...
gained power in Iraq in the 1960s, taking a more aggressive stance on border disputes. In the aftermath of the
Iranian Revolution The Iranian Revolution (, ), also known as the 1979 Revolution, or the Islamic Revolution of 1979 (, ) was a series of events that culminated in the overthrow of the Pahlavi dynasty in 1979. The revolution led to the replacement of the Impe ...
in 1979,
Saddam Hussein Saddam Hussein (28 April 1937 – 30 December 2006) was an Iraqi politician and revolutionary who served as the fifth president of Iraq from 1979 until Saddam Hussein statue destruction, his overthrow in 2003 during the 2003 invasion of Ira ...
launched an invasion of Iran over border disputes and a desire to gain control of oil-rich areas in Iran's territory. The conflict lasted for eight years and ended in a stalemate. Iran later opposed the American-led coalition against Iraq in 1991. The fall of Saddam Hussein in 2003 and the eventual rise to power by pro-Iranian Shia factions (i.e. Islamic Dawa Party and Islamic Supreme Council of Iraq) led to the normalization of relations between the two countries. Since 2003, Iraq has allowed Shia Muslims from Iran to make the pilgrimage to holy Shia sites in Iraq. In March 2008, Iranian president
Mahmoud Ahmadinejad Mahmoud Ahmadinejad (born Mahmoud Sabbaghian on 28 October 1956) is an Iranian Iranian principlists, principlist and Iranian nationalism, nationalist politician who served as the sixth president of Iran from 2005 to 2013. He is currently a mem ...
became the first Iranian Head of State to visit Iraq since Iran's 1979
Islamic revolution The Iranian Revolution (, ), also known as the 1979 Revolution, or the Islamic Revolution of 1979 (, ) was a series of events that culminated in the overthrow of the Pahlavi dynasty in 1979. The revolution led to the replacement of the Im ...
. Former Iraqi prime minister
Nouri al-Maliki Nouri Kamil Muhammad-Hasan al-Maliki (; born 20 June 1950), also known as Jawad al-Maliki (), is an Iraqi politician and leader of the Islamic Dawa Party since 2007. He served as the Prime Minister of Iraq from 2006 to 2014 and as Vice President ...
has made several state visits to Iran since 2006 and expressed sympathy with Iran over its nuclear energy program. Iran has since become Iraq's largest trading partner. Iran and Iraq are very close allies supporting each other against the
Islamic State The Islamic State (IS), also known as the Islamic State of Iraq and the Levant (ISIL), the Islamic State of Iraq and Syria (ISIS) and Daesh, is a transnational Salafi jihadism, Salafi jihadist organization and unrecognized quasi-state. IS ...
. The relationship between the two countries is strong in part because both governments are dominated by
Shi'ite Shia Islam is the second-largest branch of Islam. It holds that Muhammad designated Ali ibn Abi Talib () as both his political successor (caliph) and as the spiritual leader of the Muslim community (imam). However, his right is understood to ...
Muslims. Increasing influence of Tehran in Iraqi politics has led to civilians protesting the foreign involvement and presence of Iran-backed militias harassing and attacking citizens. Iran has an
embassy A diplomatic mission or foreign mission is a group of people from a Sovereign state, state or organization present in another state to represent the sending state or organization officially in the receiving or host state. In practice, the phrase ...
in
Baghdad Baghdad ( or ; , ) is the capital and List of largest cities of Iraq, largest city of Iraq, located along the Tigris in the central part of the country. With a population exceeding 7 million, it ranks among the List of largest cities in the A ...
and four consulates general in
Basra Basra () is a port city in Iraq, southern Iraq. It is the capital of the eponymous Basra Governorate, as well as the List of largest cities of Iraq, third largest city in Iraq overall, behind Baghdad and Mosul. Located near the Iran–Iraq bor ...
,
Sulaymaniyah Sulaymaniyah or Slemani (; ), is a city in the east of the Kurdistan Region of Iraq and is the capital of the Sulaymaniyah Governorate. It is surrounded by the Azmar (Ezmer), Goizha (Goyje) and Qaiwan (Qeywan) Mountains in the northeast, Bara ...
,
Erbil Erbil (, ; , ), also called Hawler (, ), is the capital and most populated city in the Kurdistan Region of Iraq. The city is the capital of the Erbil Governorate. Human settlement at Erbil may be dated back to the 5th millennium BC. At the h ...
and
Karbala Karbala is a major city in central Iraq. It is the capital of Karbala Governorate. With an estimated population of 691,100 people in 2024, Karbala is the second largest city in central Iraq, after Baghdad. The city is located about southwest ...
. Iraq has an embassy in
Tehran Tehran (; , ''Tehrân'') is the capital and largest city of Iran. It is the capital of Tehran province, and the administrative center for Tehran County and its Central District (Tehran County), Central District. With a population of around 9. ...
and three consulates general in
Kermanshah Kermanshah is a city in the Central District (Kermanshah County), Central District of Kermanshah province, Kermanshah province, Iran, serving as capital of the province, the county, and the district. The city is from Tehran in the western pa ...
,
Ahvaz Ahvaz (; ) is a city in the Central District of Ahvaz County, Khuzestan province, Iran, serving as capital of the province, the county, and the district. It is home to Persians, Arabs and other groups such as Qashqai and Kurds. Languages spok ...
and
Mashhad Mashhad ( ; ), historically also known as Mashad, Meshhed, or Meshed in English, is the List of Iranian cities by population, second-most-populous city in Iran, located in the relatively remote north-east of the country about from Tehran. ...
. On 7 September 2018, Iraqi citizens set the Iranian embassy on fire as a part of a series of protests and arson against the foreign power seen as becoming too influential in local domestic politics. On 27 November 2019, Iraqi protesters burned down the Iranian consulate in Najaf.


History


Antiquity


Akkadian Empire

Sargon of Akkad Sargon of Akkad (; ; died 2279 BC), also known as Sargon the Great, was the first ruler of the Akkadian Empire, known for his conquests of the Sumerian city-states in the 24th to 23rd centuries BC.The date of the reign of Sargon is highly unc ...
(r. 2334–2279 BC) was an Akkadian king who conquered
Sumer Sumer () is the earliest known civilization, located in the historical region of southern Mesopotamia (now south-central Iraq), emerging during the Chalcolithic and Early Bronze Age, early Bronze Ages between the sixth and fifth millennium BC. ...
and was the reason of moving the power from Southern Mesopotamia (southern Iraq) to central Mesopotamia (central Iraq). Sargon's vast empire is known to have extended from
Elam Elam () was an ancient civilization centered in the far west and southwest of Iran, stretching from the lowlands of what is now Khuzestan and Ilam Province as well as a small part of modern-day southern Iraq. The modern name ''Elam'' stems fr ...
to the
Mediterranean The Mediterranean Sea ( ) is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean basin and almost completely enclosed by land: on the east by the Levant in West Asia, on the north by Anatolia in West Asia and Southern ...
sea, including Mesopotamia, parts of modern-day Iran and Syria, and possibly parts of
Anatolia Anatolia (), also known as Asia Minor, is a peninsula in West Asia that makes up the majority of the land area of Turkey. It is the westernmost protrusion of Asia and is geographically bounded by the Mediterranean Sea to the south, the Aegean ...
and the
Arabian Peninsula The Arabian Peninsula (, , or , , ) or Arabia, is a peninsula in West Asia, situated north-east of Africa on the Arabian plate. At , comparable in size to India, the Arabian Peninsula is the largest peninsula in the world. Geographically, the ...
.


Sumerian Empire

The
Third Dynasty of Ur The Third Dynasty of Ur or Ur III was a Sumerian dynasty based in the city of Ur in the 22nd and 21st centuries BC ( middle chronology). For a short period they were the preeminent power in Mesopotamia and their realm is sometimes referred to by ...
(2119–2004 BC), or 'Neo-Sumerian Empire' was a
Sumer Sumer () is the earliest known civilization, located in the historical region of southern Mesopotamia (now south-central Iraq), emerging during the Chalcolithic and Early Bronze Age, early Bronze Ages between the sixth and fifth millennium BC. ...
ian ruling dynasty based in the city of Ur (southern Iraq). The Third Dynasty of Ur came to preeminent power in
Mesopotamia Mesopotamia is a historical region of West Asia situated within the Tigris–Euphrates river system, in the northern part of the Fertile Crescent. Today, Mesopotamia is known as present-day Iraq and forms the eastern geographic boundary of ...
after several centuries of Akkadian and Gutian rule. It controlled the cities of
Isin Isin (, modern Arabic language, Arabic: Ishan al-Bahriyat) is an archaeological site in Al-Qādisiyyah Governorate, Iraq which was the location of the Ancient Near East city of Isin, occupied from the late 4th millennium Uruk period up until at ...
,
Larsa Larsa (, read ''Larsamki''), also referred to as Larancha/Laranchon (Gk. Λαραγχων) by Berossus, Berossos and connected with the biblical Arioch, Ellasar, was an important city-state of ancient Sumer, the center of the Cult (religious pra ...
and
Eshnunna Eshnunna (also Esnunak) (modern Tell Asmar in Diyala Governorate, Iraq) was an ancient Sumerian (and later Akkadian) city and city-state in central Mesopotamia 12.6 miles northwest of Tell Agrab and 15 miles northwest of Tell Ishchali. Althou ...
, and extended from the
Mediterranean The Mediterranean Sea ( ) is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean basin and almost completely enclosed by land: on the east by the Levant in West Asia, on the north by Anatolia in West Asia and Southern ...
(north
Syria Syria, officially the Syrian Arab Republic, is a country in West Asia located in the Eastern Mediterranean and the Levant. It borders the Mediterranean Sea to the west, Turkey to Syria–Turkey border, the north, Iraq to Iraq–Syria border, t ...
n) coast to the
Persian Gulf The Persian Gulf, sometimes called the Arabian Gulf, is a Mediterranean seas, mediterranean sea in West Asia. The body of water is an extension of the Arabian Sea and the larger Indian Ocean located between Iran and the Arabian Peninsula.Un ...
and
Western Iran Western Iran consists of Armenian Highlands, northern Zagros and the rich agricultural area of the Khuzestan Plain in the south. It includes the provinces of Kordestan, Kermanshah Province, Kermanshah, Ilam Province, Ilam, Lorestan, and Hamadan ...
. A salient feature of the dynasty is its establishment of the earliest known
law code A code of law, also called a law code or legal code, is a systematic collection of statutes. It is a type of legislation that purports to exhaustively cover a complete system of laws or a particular area of law as it existed at the time the co ...
after the '' Code of Urukagina''—the '' Code of Ur-Nammu''. During King Shulgi's reign, many significant changes occurred. He took steps to centralize and standardize the procedures of the empire. He is credited with standardizing administrative processes, archival documentation, the tax system, and the national calendar. The last Sumerian dynasty ended after an
Elam Elam () was an ancient civilization centered in the far west and southwest of Iran, stretching from the lowlands of what is now Khuzestan and Ilam Province as well as a small part of modern-day southern Iraq. The modern name ''Elam'' stems fr ...
ite invasion in 2004 BC. From this point on, with the growing Akkadian presence in the
region In geography, regions, otherwise referred to as areas, zones, lands or territories, are portions of the Earth's surface that are broadly divided by physical characteristics (physical geography), human impact characteristics (human geography), and ...
, the
Sumerian language Sumerian ) was the language of ancient Sumer. It is one of the List of languages by first written account, oldest attested languages, dating back to at least 2900 BC. It is a local language isolate that was spoken in ancient Mesopotamia, in the a ...
declined, after more than three thousand years of cultural identity, as the population increasingly adopted Akkadian. Future Babylonian Kings carried the title 'King of Sumer and Akkad', however, for some fourteen centuries to come. The title would also be claimed by Cyrus of Persia in the 6th century BC.


Assyrian Empire

The
Neo-Assyrian Empire The Neo-Assyrian Empire was the fourth and penultimate stage of ancient Assyrian history. Beginning with the accession of Adad-nirari II in 911 BC, the Neo-Assyrian Empire grew to dominate the ancient Near East and parts of South Caucasus, Nort ...
(934–609 BC) was a multi-ethnic state composed of many peoples and tribes of different origins. During this period,
Aramaic Aramaic (; ) is a Northwest Semitic language that originated in the ancient region of Syria and quickly spread to Mesopotamia, the southern Levant, Sinai, southeastern Anatolia, and Eastern Arabia, where it has been continually written a ...
was made an official language of the empire, alongside the
Akkadian language Akkadian ( ; )John Huehnergard & Christopher Woods, "Akkadian and Eblaite", ''The Cambridge Encyclopedia of the World's Ancient Languages''. Ed. Roger D. Woodard (2004, Cambridge) Pages 218–280 was an East Semitic language that is attested ...
. In the preceding
Middle Assyrian period The Middle Assyrian Empire was the third stage of Assyrian history, covering the history of Assyria from the accession of Ashur-uballit I 1363 BC and the rise of Assyria as a territorial kingdom to the death of Ashur-dan II in 912 BC. ...
(14th to 10th century BC), Assyria had been a minor kingdom of northern Mesopotamia (northern
Iraq Iraq, officially the Republic of Iraq, is a country in West Asia. It is bordered by Saudi Arabia to Iraq–Saudi Arabia border, the south, Turkey to Iraq–Turkey border, the north, Iran to Iran–Iraq border, the east, the Persian Gulf and ...
), competing for dominance with its southern Mesopotamian rival
Babylonia Babylonia (; , ) was an Ancient history, ancient Akkadian language, Akkadian-speaking state and cultural area based in the city of Babylon in central-southern Mesopotamia (present-day Iraq and parts of Kuwait, Syria and Iran). It emerged as a ...
. In 647 BC, the Assyrian king Ashurbanipal leveled the Elamite capital city of Susa during a war in which the inhabitants apparently participated on an opposing side. A tablet unearthed in 1854 by Austen Henry Layard in Nineveh reveals Ashurbanipal as an "avenger", seeking retribution for the humiliations the Elamites had inflicted on the Mesopotamians over the centuries. Assyrian rule succumbed to
Babylonia Babylonia (; , ) was an Ancient history, ancient Akkadian language, Akkadian-speaking state and cultural area based in the city of Babylon in central-southern Mesopotamia (present-day Iraq and parts of Kuwait, Syria and Iran). It emerged as a ...
with the Fall of Nineveh in 612 BC.


Babylonian Empire

In the golden age of
Babylon Babylon ( ) was an ancient city located on the lower Euphrates river in southern Mesopotamia, within modern-day Hillah, Iraq, about south of modern-day Baghdad. Babylon functioned as the main cultural and political centre of the Akkadian-s ...
,
Nabopolassar Nabopolassar (, meaning "Nabu, protect the son") was the founder and first king of the Neo-Babylonian Empire, ruling from his coronation as king of Babylon in 626 BC to his death in 605 BC. Though initially only aimed at restoring and securing ...
was intent on conquering from the pharaoh Necho II (who was still hoping to restore Assyrian power) the western provinces of Syria, and to this end dispatched his son
Nebuchadnezzar II Nebuchadnezzar II, also Nebuchadrezzar II, meaning "Nabu, watch over my heir", was the second king of the Neo-Babylonian Empire, ruling from the death of his father Nabopolassar in 605 BC to his own death in 562 BC. Often titled Nebuchadnezzar ...
with a powerful army westward. In the ensuing Battle of
Carchemish Carchemish ( or ), also spelled Karkemish (), was an important ancient capital in the northern part of the region of Syria. At times during its history the city was independent, but it was also part of the Mitanni, Hittite and Neo-Assyrian ...
in 605 BC, the Egyptian army was defeated and driven back, and Syria and Phoenicia were brought under the sway of Babylon. Nabopolassar died in August of that year, and Nebuchadrezzar II returned home to Babylon to ascend to the throne. After the defeat of the
Cimmerians The Cimmerians were an Ancient Iranian peoples, ancient Eastern Iranian languages, Eastern Iranian peoples, Iranic Eurasian nomads, equestrian nomadic people originating in the Pontic–Caspian steppe, part of whom subsequently migrated into W ...
and
Scythians The Scythians ( or ) or Scyths (, but note Scytho- () in composition) and sometimes also referred to as the Pontic Scythians, were an Ancient Iranian peoples, ancient Eastern Iranian languages, Eastern Iranian peoples, Iranian Eurasian noma ...
, all of Nebuchadrezzar's expeditions were directed westwards, although a powerful neighbour lay to the North; the cause of this was that a wise political marriage with Amytis of Babylon, the daughter of the
Median The median of a set of numbers is the value separating the higher half from the lower half of a Sample (statistics), data sample, a statistical population, population, or a probability distribution. For a data set, it may be thought of as the “ ...
king, had ensured a lasting peace between the two empires. Though
Babylonia Babylonia (; , ) was an Ancient history, ancient Akkadian language, Akkadian-speaking state and cultural area based in the city of Babylon in central-southern Mesopotamia (present-day Iraq and parts of Kuwait, Syria and Iran). It emerged as a ...
was annexed by the rising
Persian Empire The Achaemenid Empire or Achaemenian Empire, also known as the Persian Empire or First Persian Empire (; , , ), was an Iranian empire founded by Cyrus the Great of the Achaemenid dynasty in 550 BC. Based in modern-day Iran, it was the larg ...
in 539 BC, the Sumero–Akkadian culture of the Mesopotamians significantly influenced the succeeding empires of the Indo-Iranian tribes of the
Medes The Medes were an Iron Age Iranian peoples, Iranian people who spoke the Median language and who inhabited an area known as Media (region), Media between western Iran, western and northern Iran. Around the 11th century BC, they occupied the m ...
and the
Persia Iran, officially the Islamic Republic of Iran (IRI) and also known as Persia, is a country in West Asia. It borders Iraq to the west, Turkey, Azerbaijan, and Armenia to the northwest, the Caspian Sea to the north, Turkmenistan to the nort ...
ns.


Achaemenid Iranian Empire

In 539 BC, Persian forces led by
Cyrus The Great Cyrus II of Persia ( ; 530 BC), commonly known as Cyrus the Great, was the founder of the Achaemenid Empire. Achaemenid dynasty (i. The clan and dynasty) Hailing from Persis, he brought the Achaemenid dynasty to power by defeating the Media ...
defeated Babylonian forces at the
Battle of Opis The Battle of Opis was the last major military engagement between the Achaemenid Empire and the Neo-Babylonian Empire, which took place in September 539 BC, during the Persian invasion of Mesopotamia. At the time, Babylonia was the last major ...
, east of the
Tigris The Tigris ( ; see #Etymology, below) is the eastern of the two great rivers that define Mesopotamia, the other being the Euphrates. The river flows south from the mountains of the Armenian Highlands through the Syrian Desert, Syrian and Arabia ...
. Cyrus entered
Babylon Babylon ( ) was an ancient city located on the lower Euphrates river in southern Mesopotamia, within modern-day Hillah, Iraq, about south of modern-day Baghdad. Babylon functioned as the main cultural and political centre of the Akkadian-s ...
and presented himself as a traditional Mesopotamian monarch, restoring temples and releasing political prisoners. Upon assuming power, Cyrus appointed provincial governors (the predecessors of the Persian
satrap A satrap () was a governor of the provinces of the ancient Median kingdom, Median and Achaemenid Empire, Persian (Achaemenid) Empires and in several of their successors, such as in the Sasanian Empire and the Hellenistic period, Hellenistic empi ...
s), and he required from his subjects only tribute and obedience. Following Cyrus's death, a brief period of
Babylonia Babylonia (; , ) was an Ancient history, ancient Akkadian language, Akkadian-speaking state and cultural area based in the city of Babylon in central-southern Mesopotamia (present-day Iraq and parts of Kuwait, Syria and Iran). It emerged as a ...
n unrest ensued that climaxed in 522 B.C. with a general rebellion of Iranian colonies. Between 520 and 485 BC, the Iranian leader,
Darius the Great Darius I ( ; – 486 BCE), commonly known as Darius the Great, was the third King of Kings of the Achaemenid Empire, reigning from 522 BCE until his death in 486 BCE. He ruled the empire at its territorial peak, when it included much of West A ...
, reimposed political stability in
Babylon Babylon ( ) was an ancient city located on the lower Euphrates river in southern Mesopotamia, within modern-day Hillah, Iraq, about south of modern-day Baghdad. Babylon functioned as the main cultural and political centre of the Akkadian-s ...
and ushered in a period of great economic prosperity. His greatest achievements were in road building, which significantly improved communication among the provinces, and in organizing an efficient bureaucracy. Darius's death in 485 B.C. was followed by a period of decay that led to a major Babylonian rebellion in 482 B.C. The Iranians violently quelled the uprising, and the repression that followed severely damaged Babylon's economic infrastructure. The first Iranian kings to rule Iraq followed Mesopotamian land-management practices conscientiously. Between 485 B.C. and the conquest by
Alexander the Great Alexander III of Macedon (; 20/21 July 356 BC – 10/11 June 323 BC), most commonly known as Alexander the Great, was a king of the Ancient Greece, ancient Greek kingdom of Macedonia (ancient kingdom), Macedon. He succeeded his father Philip ...
in 331 B.C., however, very little in Babylon was repaired and few of its once-great cities remained intact. Trade also was greatly reduced during this period. The established trade route from
Sardis Sardis ( ) or Sardes ( ; Lydian language, Lydian: , romanized: ; ; ) was an ancient city best known as the capital of the Lydian Empire. After the fall of the Lydian Empire, it became the capital of the Achaemenid Empire, Persian Lydia (satrapy) ...
to
Susa Susa ( ) was an ancient city in the lower Zagros Mountains about east of the Tigris, between the Karkheh River, Karkheh and Dez River, Dez Rivers in Iran. One of the most important cities of the Ancient Near East, Susa served as the capital o ...
did not traverse
Babylonia Babylonia (; , ) was an Ancient history, ancient Akkadian language, Akkadian-speaking state and cultural area based in the city of Babylon in central-southern Mesopotamia (present-day Iraq and parts of Kuwait, Syria and Iran). It emerged as a ...
, and the Iranian rulers, themselves much closer to the Orient, were able to monopolize trade from
India India, officially the Republic of India, is a country in South Asia. It is the List of countries and dependencies by area, seventh-largest country by area; the List of countries by population (United Nations), most populous country since ...
and other eastern points. As a result, Babylonia and
Assyria Assyria (Neo-Assyrian cuneiform: , ''māt Aššur'') was a major ancient Mesopotamian civilization that existed as a city-state from the 21st century BC to the 14th century BC and eventually expanded into an empire from the 14th century BC t ...
, which together formed the ninth satrapy of the
Persian Empire The Achaemenid Empire or Achaemenian Empire, also known as the Persian Empire or First Persian Empire (; , , ), was an Iranian empire founded by Cyrus the Great of the Achaemenid dynasty in 550 BC. Based in modern-day Iran, it was the larg ...
, became economically isolated and impoverished. Their poverty was exacerbated by the extremely high taxes levied on them: they owed the Iranian crown 1,000 talents of silver a year, in addition to having to meet the extortionate demands of the local administrators, and they were responsible for feeding the Iranian court for four months every year.


Seleucid Empire

By the fourth century B.C., nearly all of Babylon opposed the Achaemenids. Thus, when the Iranian forces stationed in Babylon surrendered to Alexander in 331 B.C. all of Babylonia hailed him as a liberator. Alexander quickly won Babylonian favor when, unlike the Achaemenids, he displayed respect for such Babylonian traditions as the worship of their chief god,
Marduk Marduk (; cuneiform: Dingir, ᵈAMAR.UTU; Sumerian language, Sumerian: "calf of the sun; solar calf"; ) is a god from ancient Mesopotamia and patron deity of Babylon who eventually rose to prominence in the 1st millennium BC. In B ...
. Alexander also proposed ambitious schemes for Babylon. He planned to establish one of the two seats of his empire there and to make the
Euphrates The Euphrates ( ; see #Etymology, below) is the longest and one of the most historically important rivers of West Asia. Tigris–Euphrates river system, Together with the Tigris, it is one of the two defining rivers of Mesopotamia (). Originati ...
navigable all the way to the
Persian Gulf The Persian Gulf, sometimes called the Arabian Gulf, is a Mediterranean seas, mediterranean sea in West Asia. The body of water is an extension of the Arabian Sea and the larger Indian Ocean located between Iran and the Arabian Peninsula.Un ...
, where he planned to build a great port. Alexander's grandiose plans, however, never came to fruition. Returning from an expedition to the
Indus River The Indus ( ) is a transboundary river of Asia and a trans-Himalayas, Himalayan river of South Asia, South and Central Asia. The river rises in mountain springs northeast of Mount Kailash in the Western Tibet region of China, flows northw ...
, he died in Babylon; most probably from malaria contracted there in 323 B.C. at the age of 32. In the politically chaotic period after Alexander's death, his generals fought for and divided up his empire.


Parthian Empire

In 126 B.C., the Parthians, a nomadic Iranian people led by the Arsacid Dynasty, captured the Tigris–Euphrates river valley. The Parthians were able to control all trade between the East and the Greco–Roman world. For the most part, they chose to retain existing social institutions and to live in cities that already existed. Mesopotamia was immeasurably enriched by this, the mildest of all foreign occupations of the region. The population of Mesopotamia was enormously enlarged, Iranians, and
Aramaeans The Arameans, or Aramaeans (; ; , ), were a tribal Semitic people in the ancient Near East, first documented in historical sources from the late 12th century BCE. Their homeland, often referred to as the land of Aram, originally covered cent ...
. With the exception of the Roman occupation under
Trajan Trajan ( ; born Marcus Ulpius Traianus, 18 September 53) was a Roman emperor from AD 98 to 117, remembered as the second of the Five Good Emperors of the Nerva–Antonine dynasty. He was a philanthropic ruler and a successful soldier ...
(A.D. 98–117) and
Septimius Severus Lucius Septimius Severus (; ; 11 April 145 – 4 February 211) was Roman emperor from 193 to 211. He was born in Leptis Magna (present-day Al-Khums, Libya) in the Roman province of Africa. As a young man he advanced through cursus honorum, the ...
(A.D. 193–211), the Arsacids ruled until a new force of native Iranian rulers, the Persian Sassanids, conquered the region in A.D. 227.


Sassanid Iranian Empire

During the time of the
Sassanid Empire The Sasanian Empire (), officially Eranshahr ( , "Empire of the Iranians"), was an Iranian empire that was founded and ruled by the House of Sasan from 224 to 651. Enduring for over four centuries, the length of the Sasanian dynasty's reign ...
, from the 3rd century to the 7th century, the major part of Iraq was called in Persian ''Del-e Īrānshahr'' (lit. "the heart of Iran"), and its metropolis
Ctesiphon Ctesiphon ( ; , ''Tyspwn'' or ''Tysfwn''; ; , ; Thomas A. Carlson et al., “Ctesiphon — ܩܛܝܣܦܘܢ ” in The Syriac Gazetteer last modified July 28, 2014, http://syriaca.org/place/58.) was an ancient city in modern Iraq, on the eastern ba ...
(not far from present-day
Baghdad Baghdad ( or ; , ) is the capital and List of largest cities of Iraq, largest city of Iraq, located along the Tigris in the central part of the country. With a population exceeding 7 million, it ranks among the List of largest cities in the A ...
) functioned for more than 800 years as the capital city of Iran.


Medieval era


Abbasid Caliphate

The
Abbasid Caliphate The Abbasid Caliphate or Abbasid Empire (; ) was the third caliphate to succeed the Islamic prophet Muhammad. It was founded by a dynasty descended from Muhammad's uncle, Abbas ibn Abd al-Muttalib (566–653 CE), from whom the dynasty takes ...
of circa 650 A.D. was the second of the two great Islamic caliphates. It was ruled by the Abbasid dynasty of caliphs, who built their capital in
Baghdad Baghdad ( or ; , ) is the capital and List of largest cities of Iraq, largest city of Iraq, located along the Tigris in the central part of the country. With a population exceeding 7 million, it ranks among the List of largest cities in the A ...
(Iraq). The Abbasids had depended heavily on the support of
Persia Iran, officially the Islamic Republic of Iran (IRI) and also known as Persia, is a country in West Asia. It borders Iraq to the west, Turkey, Azerbaijan, and Armenia to the northwest, the Caspian Sea to the north, Turkmenistan to the nort ...
ns in their overthrow of the Umayyads. Abu al-'Abbas' successor,
al-Mansur Abū Jaʿfar ʿAbd Allāh ibn Muḥammad al-Manṣūr (; ‎; 714 – 6 October 775) usually known simply as by his laqab al-Manṣūr () was the second Abbasid caliph, reigning from 754 to 775 succeeding his brother al-Saffah (). He is known ...
, moved their capital from Damascus to the new city of Baghdad and welcomed non-Arab Muslims to their court. During the reign of its first seven caliphs, Baghdad became a center of power where Arab and Iranian cultures mingled to produce a blaze of philosophical, scientific, and literary glory. This era is remembered throughout the Muslim world, and by Iraqis in particular, as the pinnacle of the Islamic past. Abbasid Iraq eventually became part of Buyid Iran as the Buyid Emirate of Baghdad. After the Seljuk invasion, the Abbasid Caliphate regained a degree of independence. During the reign of Caliph Al-Nasir, Abbasid Iraq expanded into Iran.


Late Middle Ages

Iran and Iraq both fell to the
Mongols Mongols are an East Asian ethnic group native to Mongolia, China ( Inner Mongolia and other 11 autonomous territories), as well as the republics of Buryatia and Kalmykia in Russia. The Mongols are the principal member of the large family o ...
during the 13th century. In the 14th century, there emerged the Mongol
Jalayirid The Jalayirid Sultanate () was a dynasty of Mongol Jalayir origin, which ruled over modern-day Iraq and western Iran after the breakup of the Ilkhanate in the 1330s.Bayne Fisher, William. ''The Cambridge History of Iran'', p. 3: "From then until ...
sultanate which controlled Iraq and parts of Iran. They were later displaced by the Timurids, Qara Qoyunlu, and then the
Aq Qoyunlu The Aq Qoyunlu or the White Sheep Turkomans (, ; ) was a culturally Persianate society, Persianate,Kaushik Roy, ''Military Transition in Early Modern Asia, 1400–1750'', (Bloomsbury, 2014), 38; "Post-Mongol Persia and Iraq were ruled by two trib ...
of Iran, however the area centered around
Basra Basra () is a port city in Iraq, southern Iraq. It is the capital of the eponymous Basra Governorate, as well as the List of largest cities of Iraq, third largest city in Iraq overall, behind Baghdad and Mosul. Located near the Iran–Iraq bor ...
was always locally dominated by semi-autonomous Arab tribes like the Al-Mughamis, Musha'sha', and Muntafiq. Under them, the Emirate of Basra in southern Iraq often challenged the dynasties of Iran, until the
Safavids The Guarded Domains of Iran, commonly called Safavid Iran, Safavid Persia or the Safavid Empire, was one of the largest and longest-lasting Iranian empires. It was ruled from 1501 to 1736 by the Safavid dynasty. It is often considered the begi ...
subdued Basra in the early 16th century.


Early modern era

Despite decades of Iranian suzerainty, the Muntafiq remained autonomous and allied with the Ottomans and Portuguese. Iran briefly reoccupied Muntafiq Iraq between 1623 and 1639. By 1667, the Afrasiyab dynasty became co-rulers of southern Iraq with the Muntafiq while Ottoman suzerainty was disrespected. In 1667 the pasha of southern Iraq offered to submit to Iran, but the Safavids had no wish to antagonize the Ottomans. Similarly, the Iranians suppressed a Muntafiq revolt against Ottoman suzerainty in 1697, and returned Basra to the Ottomans in 1701. Nonetheless, Iraq was always a place of great importance to Iranians because of the abundant Shia shrines. In the early 18th century, Iraq became unified under the
Mamluks Mamluk or Mamaluk (; (singular), , ''mamālīk'' (plural); translated as "one who is owned", meaning "slave") were non-Arab, ethnically diverse (mostly Turkic, Caucasian, Eastern and Southeastern European) enslaved mercenaries, slave-sold ...
, and they assisted the Ottomans with their invasion of Iran in the 1720s. In turn, the Iranians invaded Iraq three times between 1730 and 1776, they failed to capture
Mosul Mosul ( ; , , ; ; ; ) is a major city in northern Iraq, serving as the capital of Nineveh Governorate. It is the second largest city in Iraq overall after the capital Baghdad. Situated on the banks of Tigris, the city encloses the ruins of the ...
and only briefly occupied
Basra Basra () is a port city in Iraq, southern Iraq. It is the capital of the eponymous Basra Governorate, as well as the List of largest cities of Iraq, third largest city in Iraq overall, behind Baghdad and Mosul. Located near the Iran–Iraq bor ...
after a long siege. Both countries had conflicting interests over the Kurdish emirates. In 1802, the Shah of Iran,
Fath Ali Shah Fath-Ali Shah Qajar (; 5 August 1772 – 24 October 1834) was the second Shah of Qajar Iran. He reigned from 17 June 1797 until his death on 24 October 1834. His reign saw the irrevocable ceding of Iran's northern territories in the Caucasus, com ...
, criticized the Mamluk governor of Iraq for his inability to counter the anti-Shia Wahhabis. Iran and Iraq invaded each other again during the 1820s, before the
Ottomans Ottoman may refer to: * Osman I, historically known in English as "Ottoman I", founder of the Ottoman Empire * Osman II, historically known in English as "Ottoman II" * Ottoman Empire The Ottoman Empire (), also called the Turkish Empir ...
ended Iraqi autonomy in 1831.


Modern era


Pahlavi era

Since the
Ottoman–Persian Wars The Ottoman–Persian Wars also called the Ottoman–Iranian Wars were a series of wars between the Ottoman Empire and the Safavid, Afsharid, Zand, and Qajar dynasties of Iran (also known as Persia) through the 16th–19th centuries. The Ot ...
of the 16th and 17th centuries, Iran (known as "Persia" prior to 1935) and the Ottomans fought over Iraq (then known as
Mesopotamia Mesopotamia is a historical region of West Asia situated within the Tigris–Euphrates river system, in the northern part of the Fertile Crescent. Today, Mesopotamia is known as present-day Iraq and forms the eastern geographic boundary of ...
) and full control of the
Shatt al-Arab The Shatt al-Arab () is a river about in length that is formed at the confluence of the Euphrates and Tigris rivers in the town of al-Qurnah in the Basra Governorate of southern Iraq. The southern end of the river constitutes the Iran– ...
until the signing of the
Treaty of Zuhab The Treaty of Zuhab (, ''Ahadnāmah Zuhab''), also called Treaty of Qasr-e Shirin (), signed on May 17, 1639, ended the Ottoman-Safavid War of 1623–1639. It confirmed territorial divisions in West Asia, shaping the borders between the Safavid an ...
in 1639 which established the final borders between the two countries. The Shatt al-Arab was considered an important channel for both states' oil exports, and in 1937, Iran and the newly independent Iraq signed a treaty to settle the dispute. In the same year, Iran and Iraq both joined the Treaty of Saadabad, and relations between the two states remained good for decades afterwards. The 1937 treaty recognised the Iran–Iraq border to be along the low-water mark on the Shatt al-Arab's eastern side, except at
Abadan Abadan (; ) is a city in the Central District (Abadan County), Central District of Abadan County, Khuzestan province, Khuzestan province, Iran, serving as capital of both the county and the district. The city is in the southwest of the coun ...
and Khorramshahr, where the frontier ran along the
thalweg In geography, hydrography, and fluvial geomorphology, a thalweg or talweg () is the line or curve of lowest elevation within a valley or watercourse. Normally only the horizontal position of the curve is considered (as viewed on a map); the c ...
(deepest part of the river valley). This gave Iraq control of most of the waterway and required Iran to pay tolls whenever its ships used it. In 1955, both nations joined the Baghdad Pact. However, the overthrow of the
Hashemites The Hashemites (), also House of Hashim, are the royal family of Jordan, which they have ruled since 1921, and were the royal family of the kingdoms of Hejaz (1916–1925), Syria (1920), and Iraq (1921–1958). The family had ruled the city of Me ...
in Iraq in 1958 brought a nationalist government to power which promptly abandoned the pact. On 18 December 1959, Iraq's new leader, General
Abd al-Karim Qasim Abdul-Karim Qasim Muhammad Bakr al-Fadhli Al-Qaraghuli al-Zubaidi ( ' ; 21 November 1914 – 9 February 1963) was an Iraqi military officer and statesman who served as the Prime Minister and de facto leader of Iraq from 1958 until his ...
, declared: "We do not wish to refer to the history of Arab tribes residing in al-Ahwaz and Mohammareh horramshahr The Ottomans handed over Mohammareh, which was part of Iraqi territory, to Iran." The Iraqi government's dissatisfaction with Iran's possession of the oil-rich
Khuzestan Province Khuzestan province () is one of the 31 Provinces of Iran. Located in the southwest of the country, the province borders Iraq and the Persian Gulf, covering an area of . Its capital is the city of Ahvaz. Since 2014, it has been part of Iran's R ...
, which the Iraqis called ''Arabistan'' and had a large
Arabic Arabic (, , or , ) is a Central Semitic languages, Central Semitic language of the Afroasiatic languages, Afroasiatic language family spoken primarily in the Arab world. The International Organization for Standardization (ISO) assigns lang ...
-speaking population, was not limited to rhetorical statements. Iraq began supporting
secession Secession is the formal withdrawal of a group from a Polity, political entity. The process begins once a group proclaims an act of secession (such as a declaration of independence). A secession attempt might be violent or peaceful, but the goal i ...
ist movements in Khuzestan, and raised the issue of its territorial claims at an
Arab League The Arab League (, ' ), officially the League of Arab States (, '), is a regional organization in the Arab world. The Arab League was formed in Cairo on 22 March 1945, initially with seven members: Kingdom of Egypt, Egypt, Kingdom of Iraq, ...
meeting, though unsuccessfully. Iraq showed reluctance in fulfilling existing agreements with Iran—especially after Egyptian President
Gamal Abdel Nasser Gamal Abdel Nasser Hussein (15 January 1918 – 28 September 1970) was an Egyptian military officer and revolutionary who served as the second president of Egypt from 1954 until his death in 1970. Nasser led the Egyptian revolution of 1952 a ...
's death in 1970 and the Iraqi Ba'ath Party's rise which took power in a 1968 coup, leading Iraq to take on the self-appointed role of "leader of the
Arab world The Arab world ( '), formally the Arab homeland ( '), also known as the Arab nation ( '), the Arabsphere, or the Arab states, comprises a large group of countries, mainly located in West Asia and North Africa. While the majority of people in ...
". At the same time, by the late 1960s, the build-up of Iranian power under Shah
Mohammad Reza Pahlavi Mohammad Reza Pahlavi (26 October 1919 – 27 July 1980) was the last List of monarchs of Iran, Shah of Iran, ruling from 1941 to 1979. He succeeded his father Reza Shah and ruled the Imperial State of Iran until he was overthrown by the ...
, who had gone on a military spending spree, led Iran to take a more assertive stance in the region. In April 1969, Iran abrogated the 1937 treaty over the Shatt al-Arab, and as such, ceased paying tolls to Iraq when its ships used the waterway. The Shah justified his move by arguing that almost all river borders around the world ran along the
thalweg In geography, hydrography, and fluvial geomorphology, a thalweg or talweg () is the line or curve of lowest elevation within a valley or watercourse. Normally only the horizontal position of the curve is considered (as viewed on a map); the c ...
, and by claiming that because most of the ships that used the waterway were Iranian, the 1937 treaty was unfair to Iran. Iraq threatened war over the Iranian move, but when, on 24 April 1969, an Iranian tanker escorted by Iranian warships sailed down the river, Iraq—being the militarily weaker state—did nothing. ( Joint Operation Arvand) Iran's abrogation of the treaty marked the beginning of a period of acute Iraqi-Iranian tension that was to last until the 1975 Algiers Agreement. In 1969,
Saddam Hussein Saddam Hussein (28 April 1937 – 30 December 2006) was an Iraqi politician and revolutionary who served as the fifth president of Iraq from 1979 until Saddam Hussein statue destruction, his overthrow in 2003 during the 2003 invasion of Ira ...
, Iraq's deputy prime minister, stated: "Iraq's dispute with Iran is in connection with Khuzestan, which is part of Iraq's soil and was annexed to Iran during foreign rule." Soon, Iraqi radio stations began exclusively broadcasting into "Arabistan", encouraging Arabs living in Iran and even
Baloch people The Baloch ( ) or Baluch ( ; , plural ) are a nomadic, Pastoralism, pastoral, ethnic group which speaks the Western Iranian, Western Iranic Balochi language and is native to the Balochistan region of South Asia, South and Western Asia, encompas ...
to revolt against the Shah's government. Basra TV stations began showing Iran's Khuzestan province as part of Iraq's new province of "Nāṣiriyyah" (), renaming all of its cities with Arabic names. In 1971, Iraq (now under Saddam's effective rule) broke diplomatic relations with Iran after claiming sovereignty rights over the islands of
Abu Musa Abu Musa ( , , ) is an Iranian island in the eastern Persian Gulf, found near the entrance of Strait of Hormuz. Due to the depth of sea, oil tankers and big ships have to pass between Abu Musa and Greater and Lesser Tunbs, making these is ...
,
Greater and Lesser Tunbs Greater Tunb and Lesser Tunb (, ''Tonb-e Bozorg'' and ''Tonb-e Kuchak'', , ''Tunb el-Kubra'' and ''Tunb el-Sughra'') are two small islands in the eastern Persian Gulf, close to the Strait of Hormuz. They lie at and , respectively, some from each ...
in the Persian Gulf following the withdrawal of the British. As retaliation for Iraq's claims to Khuzestan, Iran became the main patron of Iraq's
Kurd Kurds (), or the Kurdish people, are an Iranian peoples, Iranic ethnic group from West Asia. They are indigenous to Kurdistan, which is a geographic region spanning southeastern Turkey, northwestern Iran, northern Iraq, and northeastern Syri ...
ish rebels in the early 1970s, giving the Iraqi Kurds bases in Iran and arming the Kurdish groups. In addition to Iraq fomenting separatism in Iran's Khuzestan and
Balochistan Balochistan ( ; , ), also spelled as Baluchistan or Baluchestan, is a historical region in West and South Asia, located in the Iranian plateau's far southeast and bordering the Indian Plate and the Arabian Sea coastline. This arid region o ...
, both states encouraged separatist activities by Kurdish nationalists in the other state. From March 1974 to March 1975, Iran and Iraq fought border wars over Iran's support of Iraqi Kurds. In 1975, the Iraqis launched an offensive into Iran using
tank A tank is an armoured fighting vehicle intended as a primary offensive weapon in front-line ground combat. Tank designs are a balance of heavy firepower, strong armour, and battlefield mobility provided by tracks and a powerful engine; ...
s, though the Iranians defeated them. Several other attacks took place; however, Iran had the world's fifth most powerful military at the time and easily defeated the Iraqis with its
air force An air force in the broadest sense is the national military branch that primarily conducts aerial warfare. More specifically, it is the branch of a nation's armed services that is responsible for aerial warfare as distinct from an army aviati ...
. As a result, Iraq decided against continuing the war, choosing instead to make concessions to
Tehran Tehran (; , ''Tehrân'') is the capital and largest city of Iran. It is the capital of Tehran province, and the administrative center for Tehran County and its Central District (Tehran County), Central District. With a population of around 9. ...
to end the Kurdish rebellion. In the 1975 Algiers Agreement, Iraq made territorial concessions—including the Shatt al-Arab waterway—in exchange for normalised relations. In return for Iraq recognising that the frontier on the waterway ran along the entire ''thalweg'', Iran ended its support of Iraq's Kurdish guerrillas. Iraqis viewed the Algiers Agreement as humiliating. However, the agreement meant the end of Iranian and American support for the
Peshmerga The Peshmerga () are the internal security forces of Kurdistan Region. According to the Constitution of Iraq, regional governments are responsible for "the establishment and organization of the internal security forces for the region such as p ...
, who were defeated by Iraq's government in a short campaign that claimed 20,000 lives. The British journalist Patrick Brogan wrote that "the Iraqis celebrated their victory in the usual manner, by executing as many of the rebels as they could lay their hands on." The relationship between the governments of Iran and Iraq briefly improved in 1978, when Iranian agents in Iraq discovered plans for a pro-Soviet coup d'état against Iraq's government. When informed of this plot, Saddam ordered the execution of dozens of his army's officers and in a sign of reconciliation, expelled
Ruhollah Khomeini Ruhollah Musavi Khomeini (17 May 1900 or 24 September 19023 June 1989) was an Iranian revolutionary, politician, political theorist, and religious leader. He was the founder of the Islamic Republic of Iran and the main leader of the Iranian ...
, an exiled leader of clerical opposition to the Shah, from Iraq. Despite this, Saddam merely considered the Algiers Agreement to be a truce, rather than a definite settlement, and waited for an opportunity to contest it. According to Mohsen Milani, "From 1921, when Britain installed Faysal Ibn Hussein as the king of the newly formed Iraq ... until 2003 ... Iraq was Iran's most hostile neighbor." Their competition was especially fierce after the 1968 Baathist coup and the concurrent withdrawal of British forces from the Persian Gulf region. Also in 1921, the British played a role in the
1921 Persian coup d'etat Nineteen or 19 may refer to: * 19 (number) * One of the years 19 BC, AD 19, 1919, 2019 Films * ''19'' (film), a 2001 Japanese film * ''Nineteen'' (1987 film), a 1987 science fiction film * '' 19-Nineteen'', a 2009 South Korean film * '' Dici ...
, which led to the rise of the
Pahlavi dynasty The Pahlavi dynasty () is an List of monarchs of Iran, Iranian royal dynasty that was the Pahlavi Iran, last to rule Iran before the country's monarchy was abolished by the Iranian Revolution in 1979. It was founded in 1925 by Reza Shah, Reza S ...
as rulers of Iran in 1925.
Reza Shah Reza Shah Pahlavi born Reza Khan (15 March 1878 – 26 July 1944) was shah of Iran from 1925 to 1941 and founder of the roughly 53 years old Pahlavi dynasty. Originally a military officer, he became a politician, serving as minister of war an ...
's Iran was in economic trouble, and he sought good ties with his neighbors in the 1920s—including Iraq. Iran and Iraq were staunchly anticommunist and pursued pro-West policies. They also cooperated in preventing the emergence of a Kurdish state. Iraq, supported by other Arab states, resisted Iranian influence under the Shah in the 1970s (which was backed by the
United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...
as part of the Twin Pillars policy). This took the form of supporting insurgencies against the Shah in
Khuzestan Province Khuzestan province () is one of the 31 Provinces of Iran. Located in the southwest of the country, the province borders Iraq and the Persian Gulf, covering an area of . Its capital is the city of Ahvaz. Since 2014, it has been part of Iran's R ...
and Iranian
Balochistan Balochistan ( ; , ), also spelled as Baluchistan or Baluchestan, is a historical region in West and South Asia, located in the Iranian plateau's far southeast and bordering the Indian Plate and the Arabian Sea coastline. This arid region o ...
. The Shah, in turn, attempted to organize a coup against
Saddam Hussein Saddam Hussein (28 April 1937 – 30 December 2006) was an Iraqi politician and revolutionary who served as the fifth president of Iraq from 1979 until Saddam Hussein statue destruction, his overthrow in 2003 during the 2003 invasion of Ira ...
in 1971 and helped Sultan Qaboos of Oman quell an Iraqi-backed rebellion. He also backed a Kurdish rebellion led by
Mustafa Barzani Mustafa Barzani (14 March 1903 – 1 March 1979), also known as Mullah Mustafa, was a Kurdish nationalist leader and one of the most prominent political figures in modern Kurdish politics. In 1946, he was chosen as the leader of the Kurdistan ...
. In 1975, Iran and Iraq signed a demarcation agreement stemming from the Kurdish rebellion, which remained in stalemate.


Iran–Iraq War

The
Iranian Revolution The Iranian Revolution (, ), also known as the 1979 Revolution, or the Islamic Revolution of 1979 (, ) was a series of events that culminated in the overthrow of the Pahlavi dynasty in 1979. The revolution led to the replacement of the Impe ...
in 1979 drastically changed Iran–Iraq relations for 24 years. War broke out between Iraq and Iran in September 1980. During the war, Iraq used chemical weapons and violence against Iraqi Kurds and
Marsh Arabs The Marsh Arabs (Arabic: عرب الأهوار ʻArab al-Ahwār "Arabs of the Marshlands"), also referred to as Ahwaris, the Maʻdān (Arabic: معدان "dweller in the plains") or Shroog ( "those from the east")—the latter two often conside ...
, who were accused of colluding with Iran. Eight years of fighting left around 600,000 dead and caused huge disasters for both sides, thereby grimly blistering ties between Tehran and Baghdad. The
United Nations The United Nations (UN) is the Earth, global intergovernmental organization established by the signing of the Charter of the United Nations, UN Charter on 26 June 1945 with the stated purpose of maintaining international peace and internationa ...
(UN) issued Resolution 598 in July 1987, demanding an unconditional ceasefire between the two nations. Both nations adopted the resolution ending the war in August 1988.


Post-war reconciliation

Although Iran condemned the
Iraqi invasion of Kuwait The Iraqi invasion of Kuwait, codenamed Project 17, began on 2 August 1990 and marked the beginning of the Gulf War. After defeating the State of Kuwait on 4 August 1990, Iraq went on to militarily occupy the country for the next seven months ...
, the former enemies reestablished diplomatic relations in October 1990; one month later, Iranian Foreign Minister
Ali Akbar Velayati Ali Akbar Velayati ( ; born 24 June 1945) is an Iranian conservative politician and physician. He is currently a member of the Expediency Discernment Council. Velayati is a distinguished professor at Shahid Beheshti University of Medical Scien ...
visited Baghdad. In January 2002, one year before the U.S.-led
Iraq War The Iraq War (), also referred to as the Second Gulf War, was a prolonged conflict in Iraq lasting from 2003 to 2011. It began with 2003 invasion of Iraq, the invasion by a Multi-National Force – Iraq, United States-led coalition, which ...
, the bilateral relations improved significantly when an Iranian delegation led by Amir Hussein Zamani visited Iraq for final negotiations to resolve the conflict through talks on issues of prisoners of war and the missing in action.


Post-Saddam

After the 2003 U.S.-led invasion, the
Iranian government The Government of the Islamic Republic of Iran (), known simply as ''Nezam'' (), is the ruling State (polity), state and current political system in Iran, in power since the Iranian Revolution and fall of the Pahlavi dynasty in 1979. Its Const ...
strongly opposed the war and called for a key role for the UN in Iraq's reconstruction. In its aftermath, Iran supported Shi'ite insurgent groups known as the Special Groups in Iraq, including the
Mahdi Army The Mahdi Army () was an Iraqi Shia militia created by Muqtada al-Sadr in June 2003 and disbanded in 2008. The Mahdi Army rose to international prominence on April 4, 2004, when it spearheaded the first major armed confrontation against the ...
,
Kata'ib Hezbollah Kata'ib Hezbollah (), also known as the Hezbollah Brigades, is an Iraqi Shia paramilitary group which is a part of the Iraqi Popular Mobilization Forces (PMF), staffing the 45th, 46th, and 47th Brigades. During the Iraq War (2003–11), the g ...
, Asa'ib Ahl al-Haq, and the
Promised Day Brigade The Promised Day Brigade (PDB; ), originally called the Muqawimun (, "Resisters"), was a Shiite organization and insurgent group operating during the Iraq War and later the Syrian Civil War. In 2010, it was one of the largest and most powerfu ...
. The U.S. responded by using the Iraqi government to combat these groups. Iran then offered assistance to Iraq's post-war reconstruction and bilateral relations began to improve. In May 2005, a transitional government led by
Ibrahim al-Jaafari Ibrahim Abdul Karim al-Eshaiker (; born 25 March 1947), better known as Ibrahim al-Jaafari, is an Iraqi politician who was Prime Minister of Iraq in the Iraqi Transitional Government from 2005 to 2006, following the January 2005 Iraqi parliamenta ...
of the pro-Iran Islamist Dawa party was established in Iraq. In mid May, Iranian foreign minister Kamal Kharazi visited Iraq and Jaafari paid a visit to Iran in July. In November, Iraqi president Jalal Talabani visited Iran, becoming the first Iraqi head of state to visit Iran in almost four decades. Iran–Iraq relations have flourished since 2005 by the exchange of high level visits: Former Iraqi PM
Nouri al-Maliki Nouri Kamil Muhammad-Hasan al-Maliki (; born 20 June 1950), also known as Jawad al-Maliki (), is an Iraqi politician and leader of the Islamic Dawa Party since 2007. He served as the Prime Minister of Iraq from 2006 to 2014 and as Vice President ...
makes frequent visits, along with Jalal Talabani visiting numerous times, to help boost bilateral cooperation in all fields. A conflict occurred in December 2009, when Iraq accused Iran of seizing an oil well on the border. On April 24, 2011, Iran and Iraq signed an extradition accord. The high-level meeting by the justice ministers of both countries in Tehran followed in the aftermath of a raid by Iraqi forces on Camp Ashraf, home of the People's Mujahedin of Iran (MEK). The MEK is designated as a terrorist organization by Iran and Iraq. Iran has taken an increasingly salient role within the Iraqi government and security forces since the United States originally withdrew and ISIS rose to power. In Basra alone, there are numerous stories of Iranian militant factions harassing and kidnapping civilians. On September 7, 2018, several months of protest and arson erupted into an attack against the Iranian consulate within Iraq, where it was set ablaze by rocket fire. On 9 April 2019, a day after the United States placed Iran's
IRGC The Islamic Revolutionary Guard Corps (IRGC), also known as the Iranian Revolutionary Guards, is a multi-service primary branch of the Iranian Armed Forces. It was officially established by Ruhollah Khomeini as a military branch in May 1979 i ...
in the list of "Foreign Terrorist Organizations", Iraqi Prime Minister Adel Abdel Mahdi said he had talked to all sides and tried to stop the designation. In August 2019, Iran seized an Iraqi oil tanker in the Gulf and detained seven sailors for "smuggling fuel for some Arab countries". Iraq denied any connection with the vessel and claimed to investigate the matter. A 2019 article by the
New York Times ''The New York Times'' (''NYT'') is an American daily newspaper based in New York City. ''The New York Times'' covers domestic, national, and international news, and publishes opinion pieces, investigative reports, and reviews. As one of ...
revealed leaked information detailing "years of painstaking work by Iranian spies to co-opt the country's leaders, pay Iraqi agents working for the Americans to switch sides and infiltrate every aspect of Iraq's political, economic and religious life". On 27 November 2019, Iraqi protesters burned down the Iranian consulate in Najaf. In April 2022, Iraq and Iran secured an agreement to resume Iranian gas deliveries to Iraq in exchange for Baghdad repaying debts owed to Tehran. On June 26, 2022, Iraqi Prime Minister Mustafa Al-Kadhimi said in Tehran, a day after traveling to Saudi Arabia in an effort to resurrect negotiations between the regional adversaries to end years of antagonism, that Iran and Iraq had agreed to work toward Middle East stability. On March 19, 2023, Iran's Supreme National Security Council secretary Ali Shamkhani and Iraq's National Security Advisor Qasim al-Araji signed a border security agreement to not allow armed groups in the Iraqi Kurdish region to launch border-crossing attacks on Iran. The arrangement was prompted by a missile attack from Iran's Revolutionary Guards against Iranian Kurdish groups.


Iranian Influence over Iraqi Paramilitary Forces

Following the rise of
ISIS Isis was a major goddess in ancient Egyptian religion whose worship spread throughout the Greco-Roman world. Isis was first mentioned in the Old Kingdom () as one of the main characters of the Osiris myth, in which she resurrects her sla ...
in 2014, Iraq formed the Popular Mobilization Forces (PMF), a coalition of mostly
Shiite Shia Islam is the second-largest branch of Islam. It holds that Muhammad designated Ali ibn Abi Talib () as both his political successor (caliph) and as the spiritual leader of the Muslim community (imam). However, his right is understood ...
militias created to bolster the national army's efforts in fighting the jihadist group. While formally recognized as part of Iraq’s security apparatus, several PMF factions have maintained close ties with Iran, receiving funding, training, and political backing from Tehran. These connections have led to growing concern in both Iraqi and international circles regarding the extent of Iranian influence over Iraqi internal affairs. In response to increasing U.S. pressure, the Iraqi government introduced a draft law in March 2025 aimed at restructuring the PMF. The proposed legislation seeks to formalize the chain of command by placing the PMF directly under the authority of the Iraqi Prime Minister, rather than allowing autonomous units to operate under the influence of foreign powers. The bill also includes a mandatory retirement age for senior commanders, a move expected to displace key figures aligned with Iran. The legislative push came after a February 2025 visit by PMF chairman Falih al-Fayyadh to senior Iranian officials, interpreted as an effort to garner Tehran’s support in opposing the reforms.


Commerce

Iran plays an important role in the Iraqi reconstruction. Iran's non-oil exports to Iraq were valued at $1.8 billion in 2007 and $2.3 billion in 2008. Each month, more than 40,000 Iranians visit Shiite holy sites such as
Najaf Najaf is the capital city of the Najaf Governorate in central Iraq, about 160 km (99 mi) south of Baghdad. Its estimated population in 2024 is about 1.41 million people. It is widely considered amongst the holiest cities of Shia Islam an ...
and
Karbala Karbala is a major city in central Iraq. It is the capital of Karbala Governorate. With an estimated population of 691,100 people in 2024, Karbala is the second largest city in central Iraq, after Baghdad. The city is located about southwest ...
, buying religious souvenirs and supporting the economy through tourism. Iraq imports cars, construction materials, medicine, fruits, spices, fish, air conditioners, office furniture, carpets and apparel from Iran.
Basra Basra () is a port city in Iraq, southern Iraq. It is the capital of the eponymous Basra Governorate, as well as the List of largest cities of Iraq, third largest city in Iraq overall, behind Baghdad and Mosul. Located near the Iran–Iraq bor ...
alone imports $45 million of goods from Iran each year, including carpets, construction materials, fish and spices. Each day, 100 to 150 commercial trucks transport goods from Iran to Iraq through the nearby Shalamcheh border crossing (2008). As of January 2010, the two countries signed over 100 economic and cooperation agreements. The volume of trade between Iran and Iraq reached $12 billion in 2013. The main areas of trade between the two countries are the construction, food and industrial sectors.


See also

* Arab–Iran relations * Iraqis in Iran * Shia crescent


References


Further reading

* Abdulghani, Jasim M. ''Iraq and Iran'' (Routledge, 2011
online
* Chubin, Shahram, and Charles Tripp. ''Iran and Iraq at War'' (Routledge, 2020
online review
* Ehsani, Kaveh. "War and Resentment: Critical Reflections on the Legacies of the Iran-Iraq War." in ''Debating the Iran-Iraq War in Contemporary Iran'' (Routledge, 2019) pp. 3-22
online
* Karsh, Efraim. "Geopolitical determinism: The origins of the Iran-Iraq war." ''Middle East Journal'' 44.2 (1990): 256-268
online
* * * Potter, Lawrence, and Gary Sick, eds. ''Iran, Iraq, and the legacies of war'' (Springer, 2004). * * Swearingen, Will D. "Geopolitical origins of the Iran-Iraq war." ''Geographical Review'' (1988): 405-416
online
* Takeyh, Ray. "The Iran-Iraq War: A Reassessment." ''Middle East Journal'' 64.3 (2010): 365-383. * Woods, Kevin M., et al. ''Saddam's War: An Iraqi Mililtary Perspective of the Iran-Iraq War'' (U.S. Government Printing Office, 2009
online


External links

* {{DEFAULTSORT:Iran-Iraq Relations
Iraq Iraq, officially the Republic of Iraq, is a country in West Asia. It is bordered by Saudi Arabia to Iraq–Saudi Arabia border, the south, Turkey to Iraq–Turkey border, the north, Iran to Iran–Iraq border, the east, the Persian Gulf and ...
Bilateral relations of Iraq