Tolga is a municipality in Hedmark county, Norway. It is part of the traditional region of Østerdalen. The administrative centre of the municipality is the village of Tolga.
The municipality is bordered in the east by the municipality of Tynset, in the south by Rendalen, and in the east by Engerdal and Os, all in Hedmark county.Tolga was a stronghold for the Norwegian Nazi party Nasjonal Samling during the World War II, though the party was never represented in the town council.
The municipality (originally the parish) is named after the old Tolga farm, since the first church in the parish was built here (in 1688). The farm is named after the small Tolga river, and the river name is probably derived from the word toll which means "(young) pine (tree)". Prior to 1918, the name was spelled "Tolgen".