| Duke Yi of Lu 魯懿公 | |
| Succession: | Ruler of Lu |
| Reign: | 816–807 BC |
| Predecessor: | Duke Wu of Lu |
| Successor: | Boyu (伯御) |
| Issue: | Prince Cheng (公子稱) |
| Full Name: | Ancestral name Ji (姬) |
| House: | Ji |
| Dynasty: | Lu |
| Father: | Duke Wu of Lu |
| Death Date: | 807 BC |
| Posthumous Name: | Duke Yi (懿公) |
Duke Yi of Lu, personal name Ji Xi, was a ruler of the Lu state, succeeding his father Duke Wu.
Despite being the younger son of Duke Wu, he was made heir apparent over his older brother Kuo by the intervention of King Xuan of Zhou. After nine years of rule, supporters of Kuo and of his son Boyu rose in revolt and murdered Duke Yi; Boyu was then proclaimed to be the Duke of Lu by the rebels.[1]