Quimsachata, Extinct volcano in Canchis Province, Cusco Region, Peru.

Quimsachata is a dormant volcano in the Andes of Canchis Province, Cusco Region, Peru, about 24 kilometres northwest of Sicuani. It is built from two centres: a scoria cone with a lava field, and the Oroscocha lava dome with two lava flows up to 20 metres thick. The dome is darker than the flows and covers 1.5 square kilometres.

The volcano formed through two separate eruptive phases, the first of which created the scoria cone around 11,500 years ago. A later eruption produced the lava flows that still cover much of the surrounding ground today.

The name Quimsachata probably comes from Aymara and Quechua kimsa, "three", and Pukina chata, "mountain". The complex includes a second volcano, Oroscocha, whose lava flow changed the course of the Vilcanota River. Local Inka myths may refer to volcanic activity here, even though the eruptions happened long before their civilization.

The volcano lies about 24 km northwest of Sicuani, in Canchis Province, Cusco Region, and the area is visited by national and international tourists and holds archaeological sites. As of 2021 Quimsachata was unmonitored, though plans exist to install a monitoring network; it is classed as a very low hazard volcano. The Oroscocha dome sits at 14°05′48″S 71°22′00″W.

The volcanic complex includes not only the scoria cone but also a separate dome structure filled with thick lava deposits, making it geologically more varied than a typical single volcano. Both features are visible in the landscape as you move through the area.