One ship of the United States Navy has been named Poseidon for the Greek god of the sea.
- USS Poseidon (ARL-12), an Achelous-class repair ship, served during World War II.
- A fictitious USS Poseidon (SSN-729) is the title "character" in the 2005 film USS Poseidon: Phantom Below. No vessel has ever had the hull classification symbol SSN-729. SSGN-729 (formerly SSBN-729) is the USS Georgia.
| This article includes a list of ships with the same or similar names. If an internal link for a specific ship led you here, you may wish to change the link to point directly to the intended ship article, if one exists. |