- HMS Sirius (1786) was the flagship of the First Fleet to Australia.
- HMS Sirius (1797) was a 36-gun fifth-rate frigate, and served during the Napoleonic Wars until she was lost at the Battle of Grand Port, Isle de France.
- HMS Sirius (1813) was a fifth-rate frigate.
- HMS Sirius (1868) was an Eclipse class wooden screw sloop sold in 1885.
- HMS Sirius (1892) was an Apollo class protected cruiser that served in World War I.
- HMS Sirius (82) was a Dido class light cruiser in World War II.
- HMS Sirius (F40) was a Leander-class frigate in service until 1994.
- HMAS Sirius (O 266) - Royal Australian Navy replenishment vessel, named in honour of First Fleet ship HMS Sirius (1786).
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