Sør-Fron is a municipality in Oppland county, Norway. It is part of the traditional region of Gudbrandsdal. The administrative centre of the municipality is the village of Hundorp.

The old municipality of Fron was divided into Sør-Fron and Nord-Fron in 1851. In 1966, they were merged back together again, but that only lasted until 1977 when they separated once again.

The Old Norse form of the name was Frón. The meaning of the name is unknown (maybe "earth" or "land"). Therefore, the meaning of Sør-Fron is "(the) southern (part of) Fron", since the parish and municipality of Fron was divided in 1851. In the 19th century, it was called Søndre Fron (søndre also means south).

The coat of arms is from modern times (1988). The arms show the club that smashed to pieces the statue of the god Thor standing at Hundorp.

On the north it is bordered by Nord-Fron municipality. On the west, it is bordered by Øystre Slidre. To the south it is bordered by Gausdal and Ringebu. To the east it is bordered by Folldal and Stor-Elvdal municipalities in Hedmark county.

Rondane National Park, which lies partially in Sør-Fron, was the first Norwegian National Park, established in 1962. In 2003, Rondane National Park was enlarged and smaller areas of nature protection were opened or enlarged adjacent to the park.

Villages include Frya, Hundorp, Lia and Harpefoss.

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