This is a disambiguation page for "Neptune". By "Neptune", you might mean:
- Poseidon, the Greco-Roman God of the Seas, also known as King Neptune;
- Poseidon, the unseen 2017 Continuum version of the same character;
- Neptune, a merman, Amphitrite's father and Triton's grandfather.
- Neptune, a planet in the Solar System;
- King Neptune, a 1932 cartoon short starring Poseidon.