Westport is a town in the West Coast region of the South Island of New Zealand. Established in 1861, it is the oldest European settlement on the West Coast. Originally named Buller, it is on the right bank and at the mouth of the Buller River, close by the prominent headland of Cape Foulwind. It is connected via State Highway 6 with Greymouth, 100 kilometres (62 mi) to the south, and with Nelson 222 kilometres (138 mi) in the northeast, via the Buller Gorge. The population of the Westport urban area was 4,250 as of June 2023. The Buller District had a population of 9,670.

Buller District is one of 53 districts of New Zealand, and is within the West Coast Region. It covers Westport, Karamea, Reefton and Inangahua Junction.