Obersaxen Mundaun is a municipality in the Surselva Region in the Swiss canton of Graubünden. On 1 January 2016 the former municipalities of Obersaxen and Mundaun merged to form the new municipality of Obersaxen Mundaun.

Surselva Region is one of the eleven administrative districts in the canton of Graubünden in Switzerland. It was created on 1 January 2017 as part of a reorganization of the canton.