"Hangar 18" is a song by American heavy metal band Megadeth from the 1990 album Rust in Peace. UFO conspiracy theories, or possibly Hangar 18, the 1980 film based on those theories, inspired drummer Nick Menza to write the lyrics. Shortly thereafter, frontman Dave Mustaine composed the bulk of the music. The intro is a rapidly strummed version of the D-minor arpeggio that Mustaine wrote for the Metallica instrumental track "The Call of Ktulu", which was the final Metallica song he was given writing credit for. 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. The song reached number #25 on the Irish Singles Chart, also reached number #26 on the UK Singles Chart.

The song is also particular in that the bass uses a different tuning from the two lead guitars, the bass being in Drop D while the guitars are in standard tuning.

A sequel to this song called "Return to Hangar" was included on Megadeth's ninth album The World Needs a Hero. It tells the fictional story of the life-forms said to be contained in Hangar 18 coming back to life and killing those inside the building before escaping.

"Hangar 18" was nominated for Best Metal Performance at the 1992 Grammy Awards.

The "Hangar 18" video is themed after the song's lyrical concept. It depicts the torture of aliens and, at the end, shows all the band members in freezing chambers. The video was shot in San Pedro, Los Angeles at a Water & Power building. Coincidentally, the band would film the video for "Crush 'Em" on this same site nine years later. An edited version of "Hangar 18" is typically shown on MTV2 which has the song length cut down drastically. During the intro to the video the song "Dawn Patrol" from the Rust in Peace album can be heard in the background.

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