Hangar 18 is an American core hip hop group signed to Definitive Jux Records. The group consists of rappers Alaska and Windnbreeze, and is produced by DJ paWL. The group has gained recognition touring with other artists, including El-P, Aesop Rock, Mos Def, RJD2, and Gym Class Heroes.

During their early years Alaska and Windnbreeze were active members of the Atoms Family, a group of emcees and DJs in New York's hip-hop underground. During their time working with the rest of the family, they made songs like "Prison" on the Euphony album, which personified the unique sound they were to have and the solo success they would become. The group's name is a reference to the aircraft hangar at Wright-Patterson Air Force Base which is said to house a crashed UFO from the Roswell incident.