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 (album), a 1993 album by 13 Engines
- "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