Gregorian might 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
    • Gregorian mass
    • Brotherhood of Saint Gregory
  • The Gregorian reform (Pope Gregory VII)
  • Things named for Pope Gregory XIII:
    • Gregorian calendar
    • 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 Bivolaru, founder of the Movement for Spiritual Integration into the Absolute (MISA)
  • Gregorian (band), German band that performs Gregorian chant-inspired versions of modern pop and rock songs
  • Gregorian Satellite Dish Antennas