At least four (and probably several more) ships of the Royal Navy have borne the name HMS Triton, after the son of Poseidon and Amphitrite, the personification of the roaring waters.

HMS Triton, 24 (also spelled Tryton), was burned on 28 April 1758 to avoid capture by the French.

HMS Triton, 28 served with Rear Admiral Sir Samuel Hood's fleet off Nevis on 25 January 1782.

HMS Triton, 32 was very successful in the Napoleonic Wars.

HMS Triton was the lead ship of her class of submarine during World War II.

In the early 2000s the Royal Navy operated an experimental trimaran named RV Triton, but that ship was never commissioned into the Royal Navy and so is not entitled to the "HMS" ship prefix.