Six ships of the Royal Navy have been named HMS Amethyst, whilst another was planned:
- HMS Amethyst (1793) was a 36-gun fifth-rate frigate, originally the French Perle, launched in 1790, captured in 1793, and wrecked off Alderney in 1795.
- HMS Amethyst (1799) was a Penelope-class 36-gun fifth rate launched in 1799 and wrecked in 1811.
- HMS Amethyst (1844) was a Spartan-class 26-gun sixth rate launched in 1844 and sold in 1869 for use as a cable vessel.
- HMS Amethyst (1871) was an Amethyst-class screw corvette launched in 1871 and sold in 1887.
- HMS Amethyst (1903) was a Topaze-class cruiser launched in 1903 and scrapped in 1920.
- HMS Amethyst (F116) was a modified Black Swan-class sloop launched in 1943. She was later designated as a frigate, was involved in the Yangtze Incident in 1949 and was broken up in 1957.
- HMS Amethyst was to have been a River-class minesweeper. She was renamed HMS Waveney before being launched in 1983, and was sold to the Bangladeshi Navy in 1994, being renamed Shapla.
- HM Trawler Amethyst (T12) was an anti-submarine trawler requisitioned in 1935 and sunk by a mine on 24 November 1940.
- Amethyst was the Royal Navy's bridge simulator in the 1990s at HMS Dryad, named after the Black Swan-class HMS Amethyst.
- Colledge, J. J.; Warlow, Ben (2006) . 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. OCLC 67375475.
- Hepper, David J. (1994) British Warship Losses in the Age of Sail, 1650-1859. (Rotherfield: Jean Boudriot). ISBN 0-948864-30-3
- Winfield, Rif (2008). British Warships in the Age of Sail 1793–1817: Design, Construction, Careers and Fates. Seaforth. ISBN 1-86176-246-1.
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