| Alfamayo River | |
| Name Etymology: | Quechua |
| Pushpin Map Caption: | Location in Peru |
| Subdivision Type1: | Country |
| Subdivision Name1: | Peru |
| Subdivision Type3: | Region |
| Subdivision Name3: | Cusco Region |
| Mouth: | Vilcanota River |
| Mouth Coordinates: | -13.0683°N -72.4088°W |
Alfamayo River (possibly from Quechua allpa earth, mayu river,[1] "earth river") is a river in Peru located in the Cusco Region, La Convención Province, Huayopata District. It is a right tributary of the Lucumayo, an affluent of the Vilcanota River.[2]
The Alfamayo originates south of the Huamanmarca River near the lake Huamanmarcacocha. Its direction is mainly to the southwest. The confluence with the river Lucumayo is near the village Alfamayo.