The Manhattan Project is a United States jazz group active in 1989. The name is used by several different bands, but one of the listed acts is an American jazz fusion band.

Other groups using the same name include an electronic band from Rochester, New York; a metalcore band from Greensboro, North Carolina; an emotive punk band from the Lehigh Valley in Pennsylvania; a hip hop group from Oak Ridge, Tennessee; an alternative rock band from Birmingham, UK; a melodic hardcore band from South London; and a funky hardcore, or “bombcore”, band from Salt Lake City, Utah.