Chilcayoc is a volcano in the Andes of Peru, standing about 3,347 metres (10,981 ft) above sea level. It lies in the "Valley of the Volcanoes" in the Arequipa Region, within Castilla Province and Andagua District.
The volcano is situated west of Chachas Lake and north of the volcano Jechapita. Its location places it among the volcanic features that give the Valley of the Volcanoes its name.