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