| Lake Tarnița | |
| Pushpin Map: | Romania |
| Location: | Romania |
| Coords: | 46.7211°N 23.2781°W |
| Type: | artificial lake |
| Inflow: | Someșul Cald River |
| Outflow: | Someșul Cald River |
| Basin Countries: | Romania |
| Volume: | 0.074km3 |
Lake Tarnița (ro|Lacul Tarnița) is a reservoir located in Cluj County, Romania, between the communes of Râșca, Mărișel, and Gilău, west of Cluj-Napoca. Covering some,[1] with a length of close to and a maximum depth of over, it is a popular tourist destination. Water from the Someșul Cald River flows into the reservoir. A high dam was completed in 1974.[2]