Gregorian may refer to: *The thought or ideology of

Pope Gregory I Pope Gregory I (; ; – 12 March 604), commonly known as Saint Gregory the Great (; ), was the 64th Bishop of Rome from 3 September 590 until his death on 12 March 604. He is known for instituting the first recorded large-scale mission from Ro ...

Pope Gregory VII Pope Gregory VII (; 1015 – 25 May 1085), born Hildebrand of Sovana (), was head of the Catholic Church and ruler of the Papal States from 22 April 1073 to his death in 1085. He is venerated as a saint in the Catholic Church. One of the great ...

(also called ''Gregorianism'') *Things named for

: **

Gregorian chant Gregorian chant is the central tradition of Western plainsong, plainchant, a form of monophony, monophonic, unaccompanied sacred song in Latin (and occasionally Greek language, Greek) of the Roman Catholic Church. Gregorian chant developed main ...

, the central tradition of Western plainchant, a form of monophonic, unaccompanied sacred song of the western Roman Catholic Church ** Gregorian mass ** Brotherhood of Saint Gregory, a community of friars within the Anglican Communion. The community's members, known as "Gregorians", include clergy and laymen. Since 1987 there has also been a parallel order of sisters, the Sisters of Saint Gregory ** Gregorian Antiphonary, an early Christian antiphonary, i.e. book of choral music to be sung antiphonally in services; it is associated traditionally with Pope Gregory I ** Gregorian Sacramentary, a 10th-century illuminated Latin manuscript containing a sacramentary. Since the 16th century it has been in the Vatican Library as ''Lat. 3806'' *Things named for

: **The

Gregorian Reform The Gregorian Reforms were a series of reforms initiated by Pope Gregory VII and the circle he formed in the papal curia, c. 1050–1080, which dealt with the moral integrity and independence of the clergy. The reforms are considered to be na ...

, a series of reforms initiated by Pope Gregory VII and the circle he formed in the papal curia, c. 1050–80, which dealt with the moral integrity and independence of the clergy *Things named for

Pope Gregory XIII Pope Gregory XIII (, , born Ugo Boncompagni; 7 January 1502 – 10 April 1585) was head of the Catholic Church and ruler of the Papal States from 13 May 1572 to his death in April 1585. He is best known for commissioning and being the namesake ...

: **

Gregorian calendar The Gregorian calendar is the calendar used in most parts of the world. It went into effect in October 1582 following the papal bull issued by Pope Gregory XIII, which introduced it as a modification of, and replacement for, the Julian cale ...

, internationally the most widely used civil calendar. Pope Gregory XIII introduced it in October 1582 **

Pontifical Gregorian University Pontifical Gregorian University (; also known as the Gregorian or Gregoriana), is a private university, private pontifical university in Rome, Italy. The Gregorian originated as a part of the Roman College, founded in 1551 by Ignatius of Loyo ...

, Rome **

Gregorian Tower The Gregorian Tower () or Tower of the Winds () is a square tower and early modern observatory located above the Gallery of Maps, which connects the Villa Belvedere with the Apostolic Palace in Vatican City. The tower was built between 1578 a ...

, a round tower located above the Gallery of Maps, which connects the Villa Belvedere with the Apostolic Palace in Vatican City *The

Armenian Apostolic Church The Armenian Apostolic Church () is the Autocephaly, autocephalous national church of Armenia. Part of Oriental Orthodoxy, it is one of the most ancient Christianity, Christian churches. The Armenian Apostolic Church, like the Armenian Catholic ...

, sometimes called the Gregorian Church after Saint

Gregory the Illuminator Gregory the Illuminator ( – ) was the founder and first official Catholicos of All Armenians, head of the Armenian Apostolic Church. He Christianization of Armenia, converted Armenia from Zoroastrianism in Armenia, Zoroastrianism to Chris ...

*The Gregorian telescope, named after James Gregory *

Gregorian (band) Gregorian is a German Band (music), band headed by Frank Peterson that performs Gregorian chant-inspired versions of modern pop music, pop and rock music, rock songs. The band features both vocal harmony and instrumental accompaniment. They com ...

, German band that performs Gregorian chant-inspired versions of modern pop and rock songs * Gregorian Consortium, a collaborative association of three pontifical universities/institutes in Rome * Gregorian (horse)

People

* Arthur T. Gregorian (1909–2003), Greater Boston oriental rug dealer and author of books on oriental rugs, and considered to be the world's leading collector of rare, inscribed Armenian rugs * Hrach Gregorian (born 1950), American political consultant, educator, and writer * Joyce Ballou Gregorian (1946–1991), American author, expert on Oriental rugs, and lover of Arabian horses * Mike Gregorian, American former soccer player who earned one cap with the U.S. national team in 1988 * Vartan Gregorian (1934–2021), Iranian-born Armenian-American academic, serving as the president of Carnegie Corporation of New York * Gregorian Bivolaru (born 1952), founder of the Movement for Spiritual Integration into the Absolute (MISA) {{disambiguation, surname Armenian-language surnames