| Cantumayo | |
| Name Etymology: | Quechua |
| Subdivision Type1: | Country |
| Subdivision Name1: | Peru |
| Subdivision Type3: | Region |
| Subdivision Name3: | Arequipa Region |
| Mouth: | Colca River |
Cantumayo (possibly from Quechua qantu, qantus, qantuta a plant (Cantua buxifolia), mayu river,[1]) is a river in Peru located in the Arequipa Region, Caylloma Province, Coporaque District.[2] It originates in the Chila mountain range southeast of the mountain Mismi. Its direction is mainly to the south where it meets Colca River as a right affluent. The confluence is north of the town Coporaque.