Piz Toissa, Alpine summit in Oberhalbstein Range, Switzerland

Piz Toissa is a 2,657-metre mountain west of Salouf in the canton of Graubünden, Switzerland. It belongs to the Piz Curvér group of the Oberhalbstein Alps and is separated from the Curvér massif by the Furcletta saddle. Its most striking feature is its volcano-like appearance.

Tectonic movements and erosion over millions of years shaped this peak as part of the developing Alpine range. These geological processes continue to influence the landscape today.

The painter Giovanni Segantini (1858–1899) put Piz Toissa and Piz Curvér in the background of his landscape paintings. The multi-day Senda Segantini trail links places from his life and passes through Parsonz on the mountain's southeast flank.

Routes start from Salouf (1,258 m), the Cre digl Lai car park (1,780 m) or the Munter car park (1,860 m). Via Furcletta through Val Gronda takes about 2¾ hours from Cre digl Lai, or 1½ hours from Munter through Got Grond. The final west ridge from Furcletta (2,347 m) is rated EB and takes about 45 minutes.

Piz Toissa is separated from the Curvér massif by the Furcletta saddle, and its shape has been compared to a volcano. The painter Giovanni Segantini (1858–1899) put the mountain and Piz Curvér in the background of his landscape paintings; the multi-day Senda Segantini trail passes through Parsonz on its south-east flank.