Hatun Q'asa (Quechua hatun big (jatun in Bolivia), q'asa mountain pass,[2] "big mountain pass", hispanicized spelling Jatun Casa) is a mountain in the Wansu mountain range in the Andes of Peru, about 4,800 metres (15,748 ft) high.

It is situated in the Arequipa Region, Condesuyos Province, Cayarani District.

Hatun Q'asa lies at the Q'illumayu valley (Quechua for "yellow river", also spelled Quellomayo).

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