Hair is a 1979 musical war comedy-drama and film adaptation of the 1968 Broadway musical of the same name about a Vietnam War draftee who meets and befriends a tribe of long-haired hippies on his way to the army induction center. The hippies introduce him to their environment of marijuana, LSD, unorthodox relationships and draft dodging.

"Hair" is a song recorded by American singer Lady Gaga for her second studio album, Born This Way (2011). Written and produced by Gaga and RedOne, "Hair" was released worldwide digitally on May 16, 2011, as a promotional single from the album, as part of the iTunes Store's "Countdown to Born This Way" release. This was after the previous promotional release, "The Edge of Glory", was made the third single from the album. Nevertheless, Gaga explained that "Hair" was not planned to be a single, but may be released as one if it sells well at the iTunes Store, like "The Edge of Glory".