Achilles may refer to:

• Achilles, a Sphinxian treecat, son of Nimitz and Samantha.
• HMS Achilles (Homer-class), a battlecruiser of the Royal Manticoran Navy.
• HMS Achilles (Reliant-class), a replacement vessel for the above one.
• HMS Achilles (Agamemnon-class), another battlecruiser of the Royal Manticoran Navy.

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