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).