Glynn S. Lunney (born November 27, 1936) is a retired NASA engineer. An employee of NASA since its foundation in 1958, Lunney was a flight director during the Gemini and Apollo programs, and was on duty during historic events such as the Apollo 11 lunar ascent and the pivotal hours of the Apollo 13 crisis. At the end of the Apollo program, he became manager of the Apollo-Soyuz Test Project, the first collaboration in spaceflight between the United States and the Soviet Union. Later, he served as manager of the Space Shuttle program before leaving NASA in 1985 and later becoming a Vice President of the United Space Alliance.
Lunney was a key figure in America's manned space program from Project Mercury through the coming of the Space Shuttle. He has received numerous awards for his work, including the National Space Trophy, which he was given by the Rotary Club in 2005. Chris Kraft, NASA's first flight director, described Lunney as "a true hero of the space age", saying that he was "one of the outstanding contributors to the exploration of space of the last four decades".