| Lago di Tenno | |
| Location: | Tenno, Trentino |
| Coords: | 45.9381°N 10.8158°W |
| Pushpin Map: | Italy Trentino-South Tyrol |
| Inflow: | Rì Sec, Laurino (locally called Laurel) |
| Outflow: | Picinino |
| Basin Countries: | Italy |
| Area: | 0.25km2 |
| Elevation: | 550m (1,800feet) |
Lago di Tenno is a lake at Tenno in Trentino, Italy. At an elevation of 550 m, its surface area is 0.25 km2. The lake was formed around the year 1100 following a large landslide that blocked the course of the river Rì Sec, which is currently the main tributary of the lake.In the southern portion of the lake there is a small island. The level of the lake varies over the years depending on the flow rate of the tributaries. In the years when the level is low this island becomes a kind of promontory. This area is protected by the Autonomous Province of Trento as a biotope.