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.

He completed Naval Flight Officer training at Pensacola, Florida, went on to advanced training as a radar intercept officer in the F-4J Phantom II, and subsequently reported to Fighter Squadron 142 (VF-142) based at Naval Air Station Miramar, California.

During this time, he worked as lead engineer for Space Shuttle-launched satellites, and also served as a member of the Skylab Reentry Flight Control Team.

During that mission Lounge's duties included deployment of the Australian AUSSAT communications satellite and operation of the Remote Manipulator System (RMS).

STS-51-I completed 112 orbits of the Earth before landing at Edwards Air Force Base, California, on September 3, 1985.

STS-26 Discovery, the first flight to be flown after the Challenger accident, launched from the Kennedy Space Center on September 29, 1988.

During the four-day mission, the crewmen successfully deployed the Tracking and Data Relay Satellite (TDRS-C), which was subsequently carried to orbit by the Inertial Upper Stage (IUS) rocket.

Discovery completed 64 orbits of the Earth before landing at Edwards Air Force Base, California, on October 3, 1988.

Columbia completed 142 orbits of the Earth before landing at Edwards Air Force Base, California, on December 10, 1990.

At the time, Lounge explained his resignation from the NASA Astronaut Corps by saying "This is a very tough job to leave, but I feel that three flights is my fair share, and I'm ready for a new challenge.