Kachimayu or Kachi Mayu (Quechua for "salt river", hispanicized spellings Cachimayo, Cachimayu, Cachi Mayu) may refer to:
Rivers Kachimayu (Ayacucho-Huancavelica) in the Ayacucho and Huancavelica Regions, Peru Kachimayu (Cusco) in the Cusco Region, Peru Kachimayu (Huancavelica) in the Huancavelica Region, Peru Kachimayu, one of the headwaters of the river Willkamayu in the Ayacucho Region, Peru Kachi Mayu (Oruro) in the Oruro Department, Bolivia Kachi Mayu (Chuquisaca) in the Chuquisaca Department, Bolivia
Places Cachimayo District and its seat Cachimayo in the Cusco Region, Peru