Poseidon could refer to:
- Poseidon (bar), a bar
- Poseidon (myth), the mythological god
- Poseidon-class starships
- USS Poseidon (Mann-class)
- USS Poseidon (NCC-200), a Poseidon-class vessel
- USS Poseidon (NCC-26296), a Miranda-class vessel
- USS Poseidon (Akira-class)
- USS Poseidon, a Defiant-class vessel operated by Species 8472
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