Stor-Elvdal 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 Koppang.

The parish of Store Elvedalen was established as a municipality on 1 January 1838 (see formannskapsdistrikt). The neighboring municipality of Sollia was merged with Stor-Elvdal on 1 January 1965.

The Old Norse form of the name was Elfardalr. The first element is the genitive case of elfr which means "river" (here the Glomma river) and the last element is dalr which means "valley" or "dale".

The first element Stor- (meaning "big") was later added to distinguish it from the municipality of Lille Elvedalen (now called Alvdal). (In the late Middle Ages the two districts was distinguished by ytre [meaning "outer"] and øvre [meaning "upper"].)

The coat-of-arms is from modern times (1988). The arms show two silver-colored two-man saws on a green background.

Stor-Elvdal is bordered on the north by the municipalities of Folldal and Alvdal, on the east by Rendalen, in the south by Åmot and Ringsaker, in the west by Øyer and Ringebu, and in the northwest by Sør-Fron.

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