Cosmas I of Constantinople | |
|---|---|
| Ecumenical Patriarch of Constantinople | |
| Church | Church of Constantinople |
| In office | 2 August 1075 – 8 May 1081 |
| Predecessor | John VIII of Constantinople |
| Successor | Eustratius Garidas |
| Personal details | |
| Born | ? |
| Died | after 1081 |
Cosmas I of Constantinople (Greek: Κοσμᾶς; died after 1081) was Patriarch of Constantinople from 2 August 1075 to 8 May 1081.