Lake Brunner

Infobox_lake
lake_name = Lake Brunner
image_lake = Lake Brunner Walk 1.jpg
caption_lake = Walkway beside the Lake
image_bathymetry =
caption_bathymetry =
location = Grey District, West Coast Region, South Island
coords = coord|42|37|S|171|27|E|region:NZ_type:waterbody|display=inline,title
type =
inflow =
outflow = Arnold River
catchment =
basin_countries = New Zealand
length =
width =
area = 40 km²
depth =
max-depth = 109 m
volume =
residence_time =
shore =
elevation =
islands =
cities = Moana

Lake Brunner is the largest lake in the northwestern South Island of New Zealand, covering an area of 40 km². The lake's outflow is the Arnold River, a tributary of the Grey River.

The lake lies 31 kilometres to the southeast of Greymouth. The main settlement close to the lake is Moana, on the northern shore.

Located several kilometres inland from the coast road (State Highway 6), it is less frequently visited by tourists than many of the West Coast's scenic highlights, but it is becoming increasingly popular, in part due to its reputation for fishing.

Lake Brunner is named for the 19th century explorer Thomas Brunner. The Maori name for the lake, "Kotukumoana", means "Sea of herons".