Tynset 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 Tynset.

The municipality (originally the parish) is named after the old Tynset farm (Old Norse: Tunnusetr), since the first church was built here. The first element is the genitive case of the river name Tunna (now Tonna); the last element derives from setr which means "homestead" or "farm". (The meaning of the river name is unknown.) Prior to 1918, the name was written "Tønset" (pronounced Teunset, the diphthong equivalent to that in the French: bleu).

The coat-of-arms is from modern times. They were granted on 18 October 1985. The arms show the silver/gray head of a moose on a blue background. It was chosen to symbolize the abundance of moose in the area.

(See also the coat-of-arms for Aremark, Namsos, Namsskogan and Ringsaker.)

The parish of Tønsæt was established as a municipality on 1 January 1838 (see formannskapsdistrikt). Although the municipality of Alvdal was originally a part of Tynset, it became a separate municipality in 1864. The former municipality of Kvikne was merged with Tynset in 1966.

Tynset is the municipal centre of the Nord-Østerdalen area of Hedmark county. Well positioned in the central area of mainland Norway, Tynset lies in the upper quadrant of Norway's longest valley, Østerdalen /ˈʌstərdɑːlən/ at approximately 480 metres (1,574.8 ft) above sea level. To the northeast lies the municipality of Tolga; south of Tynset are Rendalen and Alvdal; and to the west is Folldal. In the neighboring county of Sør-Trøndelag, Tynset is bordered to the north by the municipalities of Rennebu and Midtre Gauldal, and to the west by Oppdal.

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