Harlem is an unincorporated community in Harlem Township, Delaware County, in the U.S. state of Ohio.
Harlem was platted in 1849 and named for its location within Harlem Township. A post office was established at Harlem in 1830, and remained in operation until 1907.
40°9′8″N 82°50′24″W / 40.15222°N 82.84000°W