Søgne is a municipality in Vest-Agder county, Norway. Søgne was established as a municipality on 1 January 1838 (see formannskapsdistrikt). Greipstad was separated from Søgne on 1 July 1913.It is a coastal municipality, with a long stretch of coastline to the south. To the east, it borders the municipality of Kristiansand, to the north and north-east Marnardal and Songdalen, and to the west Mandal.
As opposed to the other municipalities of Vest-Agder, Søgne has not gone through a municipal merger in recent times. On the contrary, Greipstad was separated from Søgne in 1913 (and in 1964 merged with Finsland into Songdalen. The population of Søgne was 10 509 as of 1 January 2010.The municipality (originally the parish) is named after the old Søgne farm (Old Norse Sygna), since the first church was built there. The farm is named after the river Sygna (now Søgneelva) and the name of the river is derived from the verb súga which means "suck".