| Delio Lake | |
| Location: | Province of Varese, Lombardy |
| Coords: | 46.0783°N 8.7553°W |
| Basin Countries: | Italy |
| Pushpin Map: | Italy Lombardy |
| Area: | 30ha |
| Elevation: | 930m (3,050feet) |
Delio Lake is a lake in the Province of Varese, Lombardy, Italy. At an elevation of 930 m, its surface area is about 30ha. It serves as the upper reservoir for the pumped-storage Roncovalgrande Hydroelectric Plant.