Gregorian

Gregorian may refer to:


 * The thought or ideology of Pope Gregory I or Pope Gregory VII (also called Gregorianism)
 * Things named for Pope Gregory I:
 * Gregorian chant, 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
 * Things named for Pope Gregory VII:
 * The Gregorian Reform, 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:
 * Gregorian calendar, internationally the most widely used civil calendar. It is named after Pope Gregory XIII, who introduced it in October 1582
 * Pontifical Gregorian University, Rome
 * The Armenian Apostolic Church, sometimes called the Gregorian Church after Saint Gregory the Illuminator
 * The Gregorian telescope, named after James Gregory
 * Gregorian (band), German band that performs Gregorian chant-inspired versions of modern pop and rock songs
 * 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 Consortium, a collaborative association of three pontifical universities/institutes in Rome
 * 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
 * Gregorian Tower, a round tower located above the Gallery of Maps, which connects the Villa Belvedere with the Apostolic Palace in Vatican City
 * 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)