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Elevation 5,407 m (17,740 ft)
Location Bolivia, Potosí Department, Nor Lípez Province, San Pedro de Quemes Municipality, Cana Canton
Chile, Antofagasta Region, El Loa Province
Range Andes
Coordinates 20°56′0″S 68°29′0″W / 20.93333°S 68.48333°W / -20.93333; -68.48333
Type Stratovolcano
Last eruption 1867

Olca is a stratovolcano on the border of Chile and Bolivia. It lies in the middle of a 15 km long ridge composed of several stratovolcanos. Cerro Minchincha lies to the west and Paruma to the east. It is also close to the pre-Holocene Cerro Paruma. It is andesitic and dacitic in composition, with lava flows extending several kilometres north of the peak. The only activity from the ridge during historical times was a flank eruption from 1865 to 1867. The exact source of this eruption is unclear.

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