| Church: | Church of Constantinople |
| Archbishop Of: | Ecumenical Patriarch of Constantinople |
| Term: | 13 July 1925 – 29 September 1929 |
| Predecessor: | Constantine VI of Constantinople |
| Successor: | Photius II of Constantinople |
| Birth Date: | 1846 |
| Birth Place: | Skutari, Constantinople |
| Death Date: | 29 September 1929 (aged 82-83) |
| Death Place: | Fatih, Istanbul |
| Native Name: | Βασίλειος Γʹ |
| Native Name Lang: | Greek |
Basil III (Greek, Modern (1453-);: Βασίλειος Γʹ; 1846 - September 29, 1929), born Vasileios Georgiadis (Βασίλειος Γεωργιάδης), was Ecumenical Patriarch of Constantinople[1] from July 13, 1925 until his death in 1929.
He studied theology and philology at the University of Athens, and obtained a PhD at the University of Munich.