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.