| Patriarch Of: | Ecumenical Patriarch of Constantinople |
| Enthroned: | 677 |
| Ended: | 679 |
| Religion: | Chalcedonian Christianity |
Theodore I (Greek: Θεόδωρος; died 28 January 687) was the Ecumenical Patriarch of Constantinople from 677 to 679. He had been preceded by Constantine I of Constantinople.[1] During this cataclysmic period, the Byzantine military overcame the Arab incursion against its walls in the Arab siege of Constantinople (674-678). He was succeeded by Patriarch George I of Constantinople.[2]