| Ruben I Armenian: Ռուբեն Ա | |
| Lord of Cilicia | |
| Succession: | Lord of Armenian Cilicia |
| Reign: | – 1095 |
| Predecessor: | (none) |
| Successor: | Constantine I |
| Issue: | Constantine I ? Thoros of Marash |
| House: | Roupenians |
| Death Place: | Kormogolo |
| Place Of Burial: | Monastery of Castalon |
Ruben I, (hy|Ռուբեն Ա; 1025/1035–1095) was the first lord of Armenian Cilicia from until his death.
The Rubenids were descendants of the Bagratids.
He was 70 (or 60) when he died; he was buried at the monastery of Castalon.[1]
The name of Roupen’s wife is unknown. His recorded children are: