Gregorian
- Armenian Apostolic Church
- Arthur T. Gregorian
- Brotherhood of Saint Gregory
- Gregorian (band)
- Gregorian (horse)
- Gregorian Antiphonary
- Gregorian Bivolaru
- Gregorian Consortium
- Gregorian Reform
- Gregorian Sacramentary
- Gregorian Tower
- Gregorian calendar
- Gregorian chant
- Gregorian mass
- Gregorian telescope
- Gregory the Illuminator
- Hrach Gregorian
- James Gregory (mathematician)
- Joyce Ballou Gregorian
- Mike Gregorian
- Pontifical Gregorian University
- Pope Gregory I
- Pope Gregory VII
- Pope Gregory XIII
- Vartan Gregorian