Two ships of the Royal Navy have been named HMS Conway Castle after Conwy Castle in Wales.

• {{HMS|Conway Castle|1804}} acquired c. 1804, was an Irish gun vessel hired to fight in the Napoleonic Wars.
• {{HMS|Conway Castle|FY509}}, launched in 1916, was a 274-ton naval trawler. She was commissioned by the Royal Navy in August 1939 and served as a minesweeper during World War II.

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