Three ships of the Royal Navy have been named HMS Swordfish after the fish.

• HMS Swordfish (1895) was a 330-ton destroyer launched in 1895 and sold in 1910.
• HMS Swordfish (1916) was a steam-powered submarine launched in 1916. She was converted into a surface patrol boat in 1917 and renamed S1.
• HMS Swordfish (61S) was an S-class submarine launched in 1931 and sunk by a naval mine in the English Channel in 1940.

• 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.

• Royal Navy History