| Marquis Ai of Jin 晉哀侯 | |
| Succession: | Marquis of Jin |
| Reign: | 718–709 BC |
| Predecessor: | Ji Xi |
| Successor: | Marquis Xiaozi |
| Father: | Ji Xi |
| Issue: | Marquis Xiaozi |
| Full Name: | Ancestral name Jī (姬) |
| Death Date: | 709 BC |
| Posthumous Name: | Marquis Ai (哀侯) |
| House: | Ji |
| Dynasty: | Jin |
Marquis Ai of Jin, personal name Ji Guang, was a marquis of the Jin state. He reigned from 718 BC to 709 BC.
In 710 BC, Marquis Ai attacked a small state south of Jin known as Xingting (陘廷). The next year, Xingting, allied with Duke Wu of Quwo, sacked Yi (翼), the capital of Jin. Duke Wu of Quwo enlisted the help of his half-uncle, Viscount Wu of Han, to kill the escaping Marquis Ai. The Jin people then supported Marquis Ai's son, Marquis Xiaozi, as the next ruler of Jin.