Buller River
General data
- Name: Buller River
- Water system: Pacific Ocean
- Water type: River
- Progression: Tasman sea -> Pacific Ocean -> Planet Earth
- Climates: Temperate
- Continents: Australia & Oceania
- Countries: New Zealand
The Buller River (Māori: Kawatiri) is a river in the South Island of New Zealand. The Buller has the highest flow of any river in the country during floods, though it is only the 13th longest river; it runs for 177 km (110 mi) from Lake Rotoiti through the Buller Gorge and into the Tasman Sea near the town of Westport. A saddle at 710 m (2,330 ft) separates the Buller from the Motupiko River and that is divided from the Wairau River by a 695 m (2,280 ft) saddle, both aligned along the Alpine Fault, as is the top of the Buller valley.