Three ships of the Royal Navy have been named HMS Implacable:
The first HMS Implacable, launched in 1795 as the French ship Duguay-Trouin, was a 74-gun third-rate ship of the line. Captured by the British on 3 November 1805, she was renamed Implacable. She was scuttled in 1949, by then the second oldest ship of the Navy (after HMS Victory).
The second HMS Implacable, launched in 1899, was a Formidable-class battleship. She served in World War I and fought at the Dardanelles. She was sold for scrapping in 1921.
The third HMS Implacable (R86), launched in 1942, was the lead ship of her class of aircraft carriers. She served in World War II and was broken up in 1954.
