Balclutha is a town in Otago, lying towards the end of the Clutha River, on the east coast of the South Island of New Zealand. It is about halfway between Dunedin and Invercargill on the Main South Line railway, State Highway 1 and the Southern Scenic Route. Balclutha has a population of 3918 (2013 census), and is the largest town in South Otago.