Cowan Lake may refer to:
Antarctica Lake Cowan (Antarctica)
Canada Cowan Lake (Saskatchewan)
United States Cowan Lake (Georgia) reservoir in Rockdale County Cowan Lake (Michigan) in Kent County Cowan Lake (Minnesota) in Lake County Cowan Lake (Carroll County, Missouri) reservoir and dam Cowan Lake East reservoir and dam in Cedar County, Missouri Cowan Lake West reservoir and dam in Cedar County, Missouri Cowan Lake (Maries County, Missouri) reservoir and dam Cowan Lake (New Mexico) in Otero County Cowan Lake (Ohio) reservoir and dam in Clinton County Cowans Gap Lake reservoir in Fulton County, Pennsylvania Cowan Lake (Texas) reservoir and dam in Baylor County
Other Cowan Lake Sailing Association Cowan Lake State Park