South Norfolk is a local government district in Norfolk, England. The largest town is Wymondham, and the district also includes the towns of Costessey, Diss, Harleston, Hingham, Loddon and Long Stratton. The council was based in Long Stratton until 2023 when it moved to the Broadland Business Park near Norwich, in the neighbouring Broadland district, as part of a shared facility with Broadland District Council. Some of the district's urban areas (including Costessey) form part of the Norwich built-up area. The district also includes numerous villages and surrounding rural areas. Some eastern parts of the district lie within The Broads.

The neighbouring districts are Breckland, Broadland, Norwich, Great Yarmouth, East Suffolk and Mid Suffolk.

The district was created on 1 April 1974 under the Local Government Act 1972, covering five former districts, which were all abolished at the same time:

The new district was named South Norfolk, reflecting its position within the wider county.

The council appointed a shared managing director with neighbouring Broadland District Council in 2018. The two councils' staff were merged in 2020 and the councils moved to a new shared building in 2023.

South Norfolk Council provides district-level services. County-level services are provided by Norfolk County Council. The whole district is also covered by civil parishes, which form a third tier of local government.

In the parts of the district within The Broads, town planning is the responsibility of the Broads Authority. The district council appoints one of its councillors to sit on that authority.

The council has been under no overall control since a by-election in May 2024. Prior to that, the council had been under Conservative majority control since 2007. The Conservatives continue to run the council, but as a minority administration.