I Corps, 1st Corps, or First Corps may refer to:

France

1st Army Corps (France) The 1st Army Corps () was first formed before World War I. During World War II it fought in the Battle for France in 1940, on the Mediterranean islands of Corsica and Elba in 1943–1944 and in the campaigns to liberate France in 1944 and inva ...

I Cavalry Corps (Grande Armée) The I Cavalry Corps of the ''Grande Armée'' was a French military unit that existed during the Napoleonic Wars. History For one month in 1806–1807, Emperor Napoleon Bonaparte split his Reserve Cavalry Corps into the I and II Cavalry Co ...

, a cavalry unit of the Imperial French Army during the Napoleonic Wars *

I Corps (Grande Armée) The I Corps of the ''Grande Armée'' was a French military unit that existed during the Napoleonic Wars. Though disbanded in 1814, following the Treaty of Fontainebleau, it was reformed in April 1815 following the return of Napoléon during th ...

, a unit of the Imperial French Army during the Napoleonic Wars

Germany

* I Cavalry Corps (German Empire), a unit of the Imperial German Army *

I Corps (German Empire) The I Army Corps / I AK () was a corps level command of the Prussian and then the German Empire, Imperial German German Army (German Empire), Armies from the 19th Century to World War I. It was established with headquarters in Königsberg (now ...

, a unit of the Imperial German Army *

I Reserve Corps (German Empire) The I Reserve Corps () was a corps level command of the German Army in World War I. Formation I Reserve Corps was formed on the outbreak of the war in August 1914 as part of the mobilisation of the Army. It was initially commanded by Generall ...

, a unit of the Imperial German Army *

I Royal Bavarian Corps The I Royal Bavarian Army Corps / I Bavarian AK () was a corps level command of the Royal Bavarian Army, part of the Imperial German Army, before and during World War I. As part of the 1868 army reform, the I Royal Bavarian Army Corps of the Bav ...

, a unit of the Bavarian Army and the Imperial German Army *

I Royal Bavarian Reserve Corps The I Royal Bavarian Reserve Corps / I Bavarian RK () was a corps level command of the Royal Bavarian Army, part of the Imperial German Army, in World War I. Formation I Royal Bavarian Reserve Corps was formed on the outbreak of the war in Augus ...

, a unit of the Bavarian Army and the Imperial German Army *

I Army Corps (Wehrmacht) The I Army Corps () was a corps of the German army during World War II. It was active between 1934 and 1945, and participated in the Invasion of Poland, the Battle of France and the campaigns on the Eastern Front before eventually ending the war ...

, a unit in World War II *

I SS Panzer Corps The I SS Panzer Corps () was a German armoured corps of the ''Waffen-SS''. It saw action on both the Western Front (World War II), Western and Eastern Front (World War II), Eastern Fronts during World War II. Formation and training The Corps was ...

, a unit in World War II

India

I Corps (British India) The I Indian Corps was an army corps of the British Indian Army in the World War I. It was formed at the outbreak of war under the title Indian Corps from troops sent to the Western Front. The British Indian Army did not have a pre-war corps stru ...

I Corps (India) The I Corps is a military field formation of the Indian Army. The Corps is headquartered at Mathura in Uttar Pradesh. It was raised on 1 April 1965. It was still being raised when it was despatched to the front in 1965. Raised as the First Stri ...

Russia and Soviet Union

1st Army Corps (Russian Empire) The 1st Army Corps () was a formation in the Imperial Russian Army that was formed in 1810 as the 1st Infantry Corps. It took part in the Russo-Turkish War of 1877–78, and later, in August 1914, the 1st Army Corps fought as part of the Second A ...

1st Guards Assault Aviation Corps The 1st Guards Kirovograd-Berlin Red Banner Order of Suvorov and Kutzov Assault Aviation Corps (1st Gv shak) was a military formation of the Red Air Force during the Second World War, and of the Soviet Air Force until 1949. It was then renamed the ...

* 1st Guards Mechanized Corps (Soviet Union) *

1st Airborne Corps (Soviet Union) The 1st Airborne Corps was an airborne corps of the Red Army during World War II. It fought in the Battle of Kiev, the Battle of Moscow and in the Battle of Demyansk. History The 1st Airborne Corps was formed in April 1941 from the 1st, 204th ...

1st Army Corps (Armed Forces of South Russia) The 1st Army Corps () was one of the main formations of the Armed Forces of South Russia (, ВСЮР; VSUR) during the Russian Civil War. Formed in November 1918, it was first established as part of a reorganization of the White movement's Voluntee ...

, a unit in the Russian Civil War *

1st Army Corps (Soviet Union) The 1st Army Corps was an army corps of the Soviet Armed Forces. It was formed in 1957 and finally deactivated in 1991. It draws its history from the 1st Rifle Corps, formed in 1922. Troops of the 1st Rifle Corps participated in the Winter War (Nove ...

* 1st Assault Aviation Corps * 1st Cavalry Corps (Russian Empire) *

1st Rifle Corps First most commonly refers to: * First, the ordinal form of the number 1 First or 1st may also refer to: Acronyms * Faint Images of the Radio Sky at Twenty-Centimeters, an astronomical survey carried out by the Very Large Array * Far Infrared a ...

, Soviet Union

United Kingdom

I Corps (United Kingdom) I Corps ("First Corps") was an army corps in existence as an active formation in the British Army for most of the 80 years from its creation in the World War I, First World War until the end of the Cold War, longer than any other corps. It had ...

I Airborne Corps (United Kingdom) The I Airborne Corps was an airborne forces corps raised by the British Army during the Second World War. Together with the U.S. XVIII Airborne Corps it was part of the First Allied Airborne Army. Formation Under the command of Lieutenant-Gen ...

1st Suffolk Artillery Volunteer Corps The 1st Suffolk Artillery Volunteers was a unit of Britain's Volunteer Force and Territorial Army from 1860 until 1955. Raised at Lowestoft in Suffolk, it served under various designations, as field artillery in Palestine during World War I and a ...

United States

I Corps (United States) The I Corps is a corps of the United States Army headquartered in Joint Base Lewis-McChord, Washington. It is a major formation of United States Army Pacific (USARPAC) and its current mission involves administrative oversight of army units i ...

I Amphibious Corps III Marine Expeditionary Force (III MEF) is a formation of the Marine Air-Ground Task Force of the United States Marine Corps. It is forward-deployed and able to rapidly conduct operations across the spectrum from humanitarian assistance and d ...

I Armored Corps (United States) The I Armored Corps was a corps-sized formation of the United States Army that was active in World War II. The Corps made landfall in Morocco in French North Africa during Operation Torch in November 1942, the Allied invasion of French North Af ...

I Corps (Union Army) I Corps (First Corps) was the designation of three different corps-sized units in the Union Army during the American Civil War. Separate formation called the I Corps served in the Army of the Ohio/ Army of the Cumberland under Alexander M. McC ...

First Corps, Army of Northern Virginia The First Corps, Army of Northern Virginia (or Longstreet's Corps) was a military unit fighting for the Confederate States of America in the American Civil War. It was formed in early 1861 and served until the spring of 1865, mostly in the Eastern ...

First Corps, Army of Tennessee The First Corps, Army of Tennessee, commonly known as Polk's Corps, Cheatham's Corps, or Hardee's Corps, was a corps of the Army of Tennessee. Formation Units of the First Corps, Army of Tennessee, were drawn from the organization of Department ...

First Army Corps (Spanish-American War) First most commonly refers to: * First, the ordinal form of the number 1 First or 1st may also refer to: Acronyms * Faint Images of the Radio Sky at Twenty-Centimeters, an astronomical survey carried out by the Very Large Array * Far Infrared a ...

I Field Force, Vietnam I Field Force, Vietnam was a corps-level command of the United States Army during the Vietnam War. Activated on 15 March 1966, it was the successor to Task Force Alpha, a provisional corps command created 1 August 1965 (renamed Field Force Vietna ...

Others

I ANZAC Corps The I ANZAC Corps (First Anzac Corps) was a combined Australian and New Zealand army corps that served during World War I. It was formed in Egypt in February 1916 as part of the reorganisation and expansion of the Australian Imperial Force and ...

, Australia and New Zealand *

I Corps (Australia) I Corps was an Australian Army corps, one of three that were raised by the Army during World War II. It was the main Australian operational corps for much of the war. Various Australian and other Allies of World War II, Allied Division (militar ...

* I Corps (Belgium) *

I Corps (Bosnia and Herzegovina) I Corps, 1st Corps, or First Corps may refer to: France * 1st Army Corps (France) * I Cavalry Corps (Grande Armée), a cavalry unit of the Imperial French Army during the Napoleonic Wars * I Corps (Grande Armée), a unit of the Imperial French Ar ...

I Canadian Corps I Canadian Corps was one of the two corps fielded by the Canadian Army during the Second World War. History From December 24, 1940, until the formation of the First Canadian Army in April 1942, there was a single unnumbered Canadian Corps. I Ca ...

I Corps (Czechoslovakia) The 1st Czechoslovak Army Corps (, ), also known as Svoboda's Army (, after its commander Ludvík Svoboda), was a military formation of the Czechoslovak Army in exile fighting on the Eastern Front alongside the Soviet Red Army in World War II. ...

* Finnish I Corps (Winter War) *

I Army Corps (Greece) The I Army Corps () was an army corps of the Hellenic Army, founded in December 1913. Originally based in Athens and covering southern Greece, since 1962 it was responsible for covering Greece's northwestern borders (Epirus and Western and Central ...

I Corps (North Korea) I Corps () is a corps of the Korean People's Army Ground Force. It is headquartered at Kumgang County but was formerly headquartered in Hoeyang County. History The Corps was activated in 1950 with a strength of 5,000 men. It took command of th ...

* I Corps (Ottoman Empire) *

I Corps (Pakistan) The I Corps is a field corps of the Pakistan Army currently headquaretered in the Mangla Cantonment, Azad Kashmir in Pakistan. Formed in 1957 as one of the tenth deployment and maneuver strike corps, it is a major ground formation and has seen ...

I Corps (Sri Lanka) 1 Corps ("First Corps") is a field corps formation of the Sri Lanka Army. The Corps is headquartered at Kilinochchi in Northern Province, Sri Lanka, Northern Province. It was raised on 17 October 2021. It was formed with the amalgamation of the Res ...

* Polish I Corps (disambiguation), several units *

1st Territorial Army Corps (Romania) The 1st Infantry Division ''Dacica'' was one of the major units of the Romanian Land Forces, with its headquarters located in Bucharest. It was the heraldic successor of the Romanian First Army. On 31 August 2015, 1st Infantry Division headquart ...

I Corps (South Korea) The I Corps is a corps of the Republic of Korea Army. It is named GWANGGAETO (1군단 '광개토부대'). It was created on July 24, 1950, just before the Battle of the Pusan Perimeter. It consisted of the 8th Infantry Division and the Capital ...

I Corps (South Vietnam) I Corps () was a corps of the Army of the Republic of Vietnam (ARVN), the army of the nation state of South Vietnam that existed from 1955 to 1975. It was one of four corps of the ARVN. This was the northernmost region of South Vietnam, bordering ...

* 1st Corps (Syria) *

1st Corps (Vietnam People's Army) 1st Corps () or Quyết thắng Corps (, literally: ''Determined Victory Corps'') was a regular army corps of the People's Army of Vietnam (PAVN). First organised in 1973 during the Vietnam War, 1st Corps had a major role in the 1975 spring offe ...

1st Corps (Yugoslav Partisans) The 1st Proletarian Corps ( sh-Latn, Prvi proleterski korpus) was a Yugoslav Partisan corps that fought against the Germans, Independent State of Croatia (NDH) and Chetniks in occupied Democratic Federal Yugoslavia during World War II. It was cre ...

, during World War II