| Wasa Mayu | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Bolivia |
| Subdivision Type3: | Region |
| Subdivision Name3: | Cochabamba Department |
| Subdivision Type5: | Municipality |
| Subdivision Name5: | Tiraque Province, Carrasco Province |
| Mouth: | Ivirizu River |
Wasa Mayu (Quechua wasa the human back or the back of an animal, mayu river, "back river" Hispanicized spelling Huasa Mayu) is a Bolivian river in the Cochabamba Department, Tiraque Province, Tiraque Municipality and in the Carrasco Province.[1] It is a left tributary of Ivirizu River,[2] the most important affluent of San Matéo River.