| Philadelphus of Byzantium | |
| Patriarch Of: | Bishop of Byzantium |
| Enthroned: | 211 |
| Ended: | 217 |
| Religion: | Early Christianity |
Philadelphus (Greek: Φιλάδελφος; died 217) is referred to as the first bishop of Byzantium after the eight-year administration of the Church of Byzantium by a priest whose name has not been recorded. He was bishop for six years (211–217).