Ōreti River
General data
- Name: Ōreti River
- Water system: Pacific Ocean
- Water type: River
- Progression: New River Estuary -> Foveaux Strait -> Tasman sea -> Pacific Ocean -> Planet Earth
- Climates: Temperate
- Continents: Australia & Oceania
- Countries: New Zealand
The Ōreti River (formerly the Oreti River) is one of the main rivers of Southland, New Zealand, and is 170 kilometres (110 mi) long. The river has been identified as an Important Bird Area by BirdLife International because, for much of its length, it supports breeding colonies of black-billed gulls.
The Ōreti has its headwaters close to the Mavora Lakes between Lake Te Anau and Lake Wakatipu, and flows south across the Southland Plains to its outflow into Foveaux Strait at the southeastern end of Oreti Beach. En route, it runs through the towns of Lumsden and Winton, before passing through the city of Invercargill, close to the river's estuary.