"Careful with That Axe, Eugene" is a Pink Floyd song. The studio recording is featured on Relics, while a live version can be found on Ummagumma. The song was originally released as the B-side of their single "Point Me at the Sky". Pink Floyd re-recorded the track for Italian director Michelangelo Antonioni's film Zabriskie Point. The song is retitled "Come in Number 51, Your Time Is Up" on the soundtrack album for the film.