Cosigüina (also spelt Cosegüina) is a stratovolcano located in the western part of Nicaragua.

The summit is truncated by a large caldera, 2 x 2.4 km in diameter and 500 m deep, holding a substantial crater lake (Laguna Cosigüina).

The earlier caldera rim is still exposed on the north side, but has been buried by the younger cone elsewhere.

According to an analysis by Berkeley Earth Surface Temperature, the 1835 eruption caused a temporary decrease in the average land temperature of Earth of about 0.75 degrees C.[3] It has not erupted since 1859, only an instant in terms of geological time.

The fairly uniform vegetation cover on the volcano's sides also attests to a general lack of gas emissions or “hot spots” on the 872-meter-high cone.