| Caonillas River | |
| Subdivision Type1: | Commonwealth |
| Subdivision Name1: | Puerto Rico |
| Subdivision Type2: | Municipality |
| Subdivision Name2: | Utuado |
| Name Etymology: | From Spanish "caonillas", plural diminutive of the Taíno word "caona" meaning 'gold'. |
The Caonillas River (Spanish; Castilian: Río Caonillas) is a river of Utuado, Puerto Rico.