Q'illu Q'asa (Quechua q'illu yellow, q'asa mountain pass, "yellow mountain pass", hispanicized spelling Quellu Casa) is a mountain in the Potosí mountain range of the Bolivian Andes, about 4,960 m (16,273  ft) high.

It is situated in the Potosí Department, southeast of Potosí.

Q'illu Q'asa lies near Q'illu Urqu.

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