Masterton (Māori: Whakaoriori), a large town in the Greater Wellington Region of New Zealand, operates as the seat of the Masterton District (a territorial authority or local-government district). It is the largest town in the Wairarapa, a region separated from Wellington by the Rimutaka ranges. It stands on the Waipoua stream between the Ruamahunga and Waingawa Rivers - 100 kilometres north-east of Wellington and 39.4 kilometres south of Eketahuna. Masterton has an urban population of 22,400, and district population of 29,000 (June 2022).