HMS Amethyst

{{Use dmy dates|date=February 2018}}

{{Use British English|date=February 2018}}

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 frigate Perle, launched in 1790, captured in 1793, and wrecked off Alderney in 1795.
• {{HMS|Amethyst|1799}} was a {{sclass|Penelope|frigate|0}} 36-gun fifth rate launched in 1799 and wrecked in 1811.
• {{HMS|Amethyst|1844}} was a {{sclass|Spartan|frigate|0}} 26-gun sixth rate launched in 1844 and sold in 1869 for use as a cable vessel.
• {{HMS|Amethyst|1873}} was an {{sclass|Amethyst|corvette|0}} screw corvette launched in 1873 and sold in 1887.
• {{HMS|Amethyst|1903}} was a {{sclass|Topaze|cruiser|0}} 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 {{sclass2|River|minesweeper}}. She was renamed {{HMS|Waveney|M2003|6}} before being launched in 1983, and was sold to the Bangladeshi Navy in 1994, being renamed Shapla.