Bluff (Māori: Motupōhue), previously known as Campbelltown and often referred to as "The Bluff", is a town and seaport in the Southland region, on the southern coast of the South Island of New Zealand serving as the main port of Invercargill.

The first ship known to have entered the harbour was the Perseverance in 1813, in search of flax trading possibilities, with the first European settlers arriving in 1823 or 1824.

At Stirling Point, there is "the town's biggest tourist attraction",[9] a signpost showing the distance and direction to various major cities and locations around the world, including the Equator and the South Pole.

East across the entry channel from Bluff is Tiwai Point, home to New Zealand's only aluminium smelter and its wharf.

Alumina is shipped from Australia and electricity is supplied by the Manapouri Power Station in Fiordland National Park.

A chain sculpture on the coast near Bluff symbolises the Māori belief that Stewart Island is anchored to South Island; a similar sculpture in Rakiura National Park represents the other end of the chain.

The Tiwai Point aluminium smelter and fossil fuel exploration activity in the Great South Basin may ensure the future relevance of the port.

[15] In July 2020, Rio Tinto announced closure of the aluminium smelter in August 2021,[16][17] after which discussions were initiated on how to utilise the energy generated in Manapouri.

[18] Bluff Harbour is the terminus for the twice-daily catamaran ferry to Stewart Island / Rakiura, 60 kilometres (37 mi) south across Foveaux Strait.

[22][23] The town previously included the Paua House, created by Fred and Myrtle Flutey.

The house became a museum after the death of the owners, but was sold and in March 2007 the exhibits removed to Christchurch.