Lake Winnipegosis

Infobox_lake
lake_name = Lake Winnipegosis
image_lake =
caption_lake =
image_bathymetry = Lake Winnipeg map.pngcaption_bathymetry = map
location = Manitoba
coords = coord|52|30|N|100|00|W|region:CA_type:waterbody|display=inline,title
type =
inflow = Red Deer, Woody, Swan
outflow = Water Hen River
catchment = 49,825 km² (19,237 mi²)
basin_countries = Canada
length = 195 km (121 mi)
width = 51 km (32 mi)
area = 5,370 km² (2,075 mi²)
depth =
max-depth = 12 m (40 ft)
volume =
residence_time =
shore =
elevation = 254 m (833 feet)
islands =
cities = Camperville Winnipegosis

Lake Winnipegosis (coord|52|30|N|100|00|W|type:waterbody_region:CA; see "Lake Winnibigoshish") is a large (5,370 km²) lake in central North America, in Manitoba, Canada, some 300 km northwest of Winnipeg. It is Canada's eleventh-largest lake. An alternate spelling, once common but now rare, is Lake Winipigoos or simply 'Lake Winipigis'.

The elongated, 195 kilometre long lake is the second-largest of three large lakes in central Manitoba; the other two are Lake Winnipeg, the largest, and Lake Manitoba. All three lakes are on the floor of the prehistoric Glacial Lake Agassiz.

The lake's watershed extends over some 49,825 km² in Manitoba and Saskatchewan. Tributaries include the Red Deer, Woody, and Swan rivers. The lake drains through the Water Hen River into Lake Manitoba, and is thus part of the Lake Winnipeg, Nelson River, and Hudson Bay watersheds.

The lake's name derives from that of Lake Winnipeg, with a diminutive suffix. Winnipeg means 'big muddy waters' and Winnipegosis means 'little muddy waters'.

The lake is famous for its commercial fishery of walleye and other freshwater species. It is also well known for its migratory bird populations, which make it a prime hunting area in the fall.

Communities on the lake include Camperville and Winnipegosis. Winnipegosis is a village on the south end of the lake. The population is about 700 people.