|Location||Big Horn / Carbon counties in Montana; and Big Horn County in Wyoming|
|Primary inflows||Bighorn River|
|Primary outflows||Bighorn River|
|Catchment area||20,000 square miles (50,000 km2)|
|Basin countries||United States|
Bighorn Lake is a reservoir in the United States located in Southern Montana and Northern Wyoming in the Bighorn Canyon National Recreation Area. The lake is 40 mi (64 km) south of Billings, Montana. Bighorn Lake was created by the construction of Yellowtail Dam near Fort Smith, Montana in 1965. It stretches the entire 71 mi (114 km) of the Bighorn Canyon.
Eastern portion of Bighorn Lake.