John Michael "Mike" Lounge (June 28, 1946 – March 1, 2011) was an American engineer, a United States Navy officer, a Vietnam War veteran, and a NASA astronaut.
A veteran of three Space Shuttle flights, Lounge logged over 482 hours in space.
He was a mission specialist on STS-51-I (1985) and STS-26 (1988) and was the flight engineer on STS-35 (1990).