Flathead Lake
Location	Montana
Coordinates	47°54′6″N 114°6′15″W / 47.90167°N 114.10417°W / 47.90167; -114.10417
Type	Moraine-dammed lake
Primary inflows	Flathead River Swan River
Primary outflows	Flathead River
Catchment area	8,587 square miles (22,240 km2)
Basin countries	United States
Max. length	27.3 mi (43.9 km)
Max. width	15.5 mi (24.9 km)
Surface area	191.5 sq mi (496 km2)
Average depth	164.7 ft (50.2 m)
Max. depth	370.7 ft (113.0 m)
Water volume	5.56 cu mi (23.2 km3)
Residence time	3.4 years
Shore length1	161.4 mi (259.7 km)
Surface elevation	2,894 ft (882 m)
Islands	Wild Horse Island, Cromwell, Bird, Bull, Melita, Shelter, Cedar, Mother-in-Law, Dream, etc.
1 Shore length is not a well-defined measure.

Flathead Lake is a lake in Montana. It covers 197 square miles (510 km²).

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