Lake Tarnița (Romanian: Lacul Tarnița) is a reservoir located in Cluj County, Romania, between the communes of Râșca, Mărișel, and Gilău, west of Cluj-Napoca.

Covering some 215 ha (530 acres),[1] with a length of close to 9 km (5.6 mi) and a maximum depth of over 70 m (230 ft), it is a popular tourist destination.

Water from the Someșul Cald River flows into the reservoir.

A 97 m (318 ft) high dam was completed in 1974.

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