Grassy Lake may refer to:
Grassy Lake, Alberta, a hamlet in Canada Grassy Lake in Faulkner County, Arkansas Grassy Lake Dam, a small dam in Wyoming Grassy Lake (Florida), a lake in Highlands County, Florida Grassy Lake Preserve, a protected area in Florida Grassy Lake (Louisiana), a lake in St. Martin and Assumption Parishes Little Grassy Lake (Florida), a lake in Highlands County, Florida Little Grassy Lake (Illinois), a reservoir in southern Illinois
See also Grasset Lake, Quebec, Canada