Southland District is a territorial authority in the South Island of New Zealand. Southland District covers the majority of the land area of Southland Region, although the region also covers Gore District, Invercargill City and adjacent territorial waters. It has a land area of 30,400.94 km², excluding inland waters such as Lake Te Anau, Lake Manapouri, and Lake Hauroko.

Southland District contains the towns of Winton, Riverton, Lumsden and Te Anau, and the islands south of Foveaux Strait:

The seat of the District Council is Invercargill, which, however, is not part of Southland District, but a territorial authority in its own right.

Two of New Zealand's largest national parks are within the boundaries of Southland District: Fiordland National Park, and Rakiura National Park (which covers most of Stewart Island/Rakiura).

The current district mayor is Frana Cardno. She has held this position since 1992. Her deputy is Jim Copland.

Made up of twelve elected members, from ward areas, and is elected every three years.