Piz Chaschauna, Mountain summit on the Grisons–Lombardy border, Switzerland and Italy

Piz Chaschauna is a 3,070-metre mountain in the Livigno Alps on the border between Graubünden and the Italian province of Sondrio. From the southeast it appears as a modest pyramid above a broad basin of ochre-coloured scree resembling a lunar landscape, while its northern and western flanks are far steeper. Long, nearly straight ridges connect it to the Punta Casana and the Piz Trupchun, both ridges forming the state border.

The sources record no first ascent or climbing history for Piz Chaschauna. What they document is confusion over its name: on the map of the Military Geographical Institute in Florence, the Italian name Pizzo Cassana is wrongly attached to the neighbouring Punta Casana (3,007 m), while "Punta Cassana" appears on this summit, so the two labels are swapped.

The mountain carries the name Piz Chaschauna on the Swiss side and Pizzo Casana on the Italian side, reflecting the linguistic blend of this border region. These names show how close Romansh and Italian cultures sit side by side in the Alps.

Most routes reach the summit via the Bocchetta alta del Saliente (2,896 m), the lowest notch on the ridge to Punta Casana, then follow the easy south-east ridge (T2). From Pass Chaschauna the climb takes about 1.5 hours; from Ponte Calcheira near Livigno to the pass about 2.5 hours. Routes are partly pathless and rated EE or T3–T4.

The northern slope falls within the Swiss National Park while the eastern side belongs to Stelvio National Park in Lombardy. This division between two separate protected areas makes the summit a special meeting point of conservation efforts across borders.