The Tsiazompaniry Dam is a buttress dam on the Varahina-South River, a tributary of the Ikopa River, near Tsiazompaniry in the Analamanga Region of Madagascar.

It creates Lake Tsiazompaniry, the largest reservoir in the country, which has a surface area of 31 km2 (12 sq mi) and a storage volume of 260,000,000 m3 (210,000 acre⋅ft).

A second buttress dam, 1 km (0.62 mi) northwest of the main dam helps withhold the reservoir.

Water released from the dam supplies a regulated flow to hydroelectric power station at the Antelomita Dam downstream.

[1][2] Efforts to install a 5.25 MW power station at the base of the dam began in 2011.