St. Peter-Pagig is a former municipality in the district of Plessur in the Grisons, Switzerland.

It was formed on 1 January 2008 through the merger of St. Peter and Pagig.

On 1 January 2013 the former municipalities of St. Peter-Pagig, Calfreisen, Castiel, Langwies, Lüen, Molinis and Peist merged into the municipality of Arosa.

[1] Before the merger, St. Peter-Pagig had a total area of 12.1 km2 (4.7 sq mi).

[2] The former municipality is located in the Schanfigg sub-district of the Plessur district on the northern side of the mid-Schanfigg valley.