Q'illu Q'asa (Quechua q'illu yellow, q'asa mountain pass, "yellow mountain pass", also spelled Khellu Khasa) is a mountain in the Bolivian Andes which reaches a height of approximately . It is located in the Cochabamba Department, Arani Province, Vacas Municipality. It lies southwest of Qucha Quchayuq Urqu.
References Bolivian IGM map 1:50,000 Vacas 6441-II