Gregory III.
Gregory III. is the name of the following people:
- Gregory III. (Pope) († 741), Pope from 731 to 741
- Gregory III. Pahlawuni († ~ 1166), Catholicos of the Armenian Apostolic Church
- Gregory III. (Alexandria) († 1366), Orthodox Patriarch of Alexandria
- Gregory III. Mammas († 1459), Patriarch of Constantinople
- Gregory III. Laham (* 1933), Patriarch of the Melkite Greek Catholic Church
