Piz Daint, Mountain summit in Grisons, Switzerland

Piz Daint is a mountain of the Ortler Alps in the canton of Graubünden, overlooking the Ofen Pass. It rises west of the Münstertal and formed the natural boundary between the former municipalities of Tschierv and Müstair. Its west side drains into the Val Mora toward the Inn, its east side into the Val Müstair toward the Adige.

The mountain was originally recorded as Piz d'Aint, Romansh for "inner peak", a name set against the neighbouring Piz d'Ora, the "outer peak", to the east. The spelling Piz Daint was adopted towards the end of the 20th century. The summit formed the natural boundary between the former municipalities of Tschierv and Müstair.

The name Piz Daint comes from Romansh Piz d'Aint, "inner peak", set against the neighbouring Piz d'Ora, "outer peak", to the east. The spelling Piz Daint has been official since the late 20th century. The mountain also gave its name to the CSCS supercomputer announced in 2013.

The main trail starts from Tschierv village and uses marked paths that climb through changing terrain. Plan for about four hours of hiking to reach the summit, which requires moderate fitness but no technical climbing gear.

Switzerland's most powerful supercomputer carries the same name and performs complex weather and climate calculations for the entire Alpine region. This connection between a remote mountain peak and modern computing is a curious link that most visitors never discover.