Isaac I | |
|---|---|
| Syriac Orthodox Patriarch of Antioch and All the East | |
| Church | Syriac Orthodox Church |
| See | Antioch |
| Installed | 755 |
| Term ended | 756 |
| Predecessor | Iwannis I |
| Successor | Athanasius Sandalaya |
| Personal details | |
| Died | 756 |
Isaac I was the Patriarch of Antioch and head of the Syriac Orthodox Church from 755 until his death in 756. Isaac's uncanonical elevation to the patriarchal office has led him to be regarded as an illegitimate patriarch.