Two vessels of the British Royal Navy have been named HMS Sunfish:

• HMS Sunfish (1895), a Sunfish-class destroyer launched on 23 May 1895 and sold on 7 June 1920.
• HMS Sunfish (81S), an S-class submarine launched at Chatham Dockyard on 30 September 1936 and transferred to Soviet Navy in 1944. The submarine was sunk by a British aircraft in a friendly fire incident on 27 July 1944 off Norway.

References

• Colledge, J. J.; Warlow, Ben (2006) [1969]. Ships of the Royal Navy: The Complete Record of all Fighting Ships of the Royal Navy (Rev. ed.). London: Chatham Publishing. ISBN 978-1-86176-281-8.