"Hangar 18" is a progressive thrash metal song by heavy metal band Megadeth. It is the second track on their 1990 album Rust in Peace. Mustaine was likely inspired by UFO conspiracy theories or possibly the 1980 movie, 'Hangar 18'. Hangar 18 is located at Wright-Patterson Air Force Base near Dayton, Ohio, and it is speculated that an alien aircraft was brought there from Roswell in 1947.
A sequel to this song called "Return to Hangar " was included on Megadeth's ninth album, The World Needs a Hero. .