This is a disambiguation page for "Poseidon". By "Poseidon", you might mean:
- Poseidon, the Greco-Roman God of the Seas, also known as King Neptune;
- Poseidon's Trident, a magical artifact of immense power belonging to Poseidon, which was later passed on to his son Triton and is the main macguffin throughout The Little Mermaid and its sequel;
- Poseidon, the unseen 2017 Continuum version of the same character;
- The Spear of Poseidon, an artifact belonging to the 2017 Continuum Poseidon above.
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