The Clutha District is an administrative district of southern New Zealand, with its headquarters in the Otago town of Balclutha. The Clutha District has a land area of 6,362.86 km² (2,456.71 sq mi) and a 2006 census population of 16,839 usual residents. Clutha District occupies the majority of the geographical area known as South Otago.

The geography of the Clutha District is dominated by the valley of the Clutha River, which flows southeast from the lakes of Central Otago, bisecting the Clutha District and reaching the Pacific Ocean via two river mouths, one of which is not far from Kaitangata, the other is closer to Kaka Point. The two branches of the river (the Matau and the Kouau) form the island of Inch Clutha. To the south of this is the rough bush country of the Catlins, with its forests and rugged coastline. To the north of the Clutha valley is mainly rolling hill country, with the plain of the Tokomairiro River to the northeast, along with Lake Waihola and Lake Waipori, which are part of the catchment of the Taieri River. The Waipori River, the Taieri's largest tributary, forms the northeastern border of Clutha District.