| Piz Gannaretsch | |
| Elevation: | 3040 m (9974 ft) |
| Elevation Ref: | [1] |
| Prominence M: | 933 |
| Listing: | Alpine mountains above 3000 m |
| Map: | Switzerland |
| Location: | Graubünden, Switzerland |
| Range: | Lepontine Alps |
| Coordinates: | 46.612°N 8.7864°W |
Piz Gannaretsch is a mountain in the Lepontine Alps, overlooking Sedrun in Graubünden. At 3,040 metres above sea level, its summit is the highest point of the range lying between St Gotthard Pass and Lukmanier Pass. The massif of Piz Gannaretsch separates the valleys of Lake Nalps (west) and Lake Sontga Maria (east).
A glacier named Glatscher da Gannaretsch lies over the north-western flanks of Piz Gannaretsch.