Earthshaker may refer to:
Poseidon, a god in Greek mythology.
In music:
- Earthshaker (album), an album by Y&T
- The Earthshaker, an album by Koko Taylor
- Earthshaker (band), a Japanese metal band
In games:
- Earthshaker!, an accessory for the Dungeons & Dragons role-playing game
- Earthshaker! (pinball), a pinball machine