Five ships of the Royal Navy have been named HMS Halcyon. The term Halcyon originates from the Greek myth of Alcyone and means golden or marked by peace and prosperity.

• The first HMS Halcyon was the French 16-gun brig-sloop Alcyon, which HMS Narcissus captured in 1803; Halcyon was broken up 1812.
• The second HMS Halcyon (1813) was an 18-gun Cruizer-class brig-sloop launched in 1813 and wrecked the following year in Jamaica.
• The third HMS Halcyon (1894) was a Dryad-class torpedo gunboat in service from 1894 to 1919.
• The fourth HMS Halcyon (1916) was a paddle minesweeper in service from 1916 to 1921.
• The fifth HMS Halcyon (J42) was a Halcyon-class minesweeper. She was launched in 1933 and sold for scrapping in 1950.

• 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.

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.