A perpetual motion machine is a hypothetical machine that can do work indefinitely without an energy source.
Perpetual Motion Machine may also refer to: Perpetual Motion Machine (13 Engines album), 1993 Perpetual Motion Machine (Synthetic Breed album), 2010 "Perpetual Motion Machine", a song by Klaatu from the album Sir Army Suit "Perpetual Motion Machine", a song by Modest Mouse from the album No One's First, and You're Next