Diamond Lake may refer to:
U.S. geographical locations Diamond Lake (Idaho), a glacial lake in Elmore County, Idaho Diamond Lake (Illinois), a lake, neighborhood and school district in Mundelein Diamond Lake Township, Dickinson County, Iowa Diamond Lake (Cass County, Michigan), Cass County, Michigan Diamond Lake (Kandiyohi County, Minnesota) Diamond Lake, Minneapolis, a neighborhood in Minneapolis and its namesake lake Diamond Lake Township, Minnesota, a township in Lincoln County Diamond Lake (Oregon), a lake in the southern part of Oregon Diamond Lake (South Dakota), a lake Diamond Lake, Washington, and unincorporated community located in Pend Oreille County, Washington Various lakes without articles: see List of lakes named Diamond
Other geographical locations Diamond Lake (Ontario), Canada At least three lakes in New Zealand: see List of lakes of New Zealand
In fiction Diamond Lake (Greyhawk), a fictional mining town, on a lake of the same name, in the Dungeons and Dragons World of Greyhawk
See also Diamond Valley Lake, a reservoir in Southern California