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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 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 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. Pope Gregory XIII introduced it in October 1582 Pontifical Gregorian University, Rome Gregorian Tower, 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, 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 Consortium, a collaborative association of three pontifical universities/institutes in Rome Gregorian (horse)

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