Four ships of the Royal Navy have borne the name HMS Cyclops after the one-eyed Cyclops of Greek mythology.
- HMS Cyclops was a 28-gun sixth rate launched in 1779. She was used as a troopship from 1800 and was sold in 1814.
- HMS Cyclops was steam paddle wheel frigate launched in 1839 and sold in 1864.
- HMS Cyclops was a turret ship launched in 1871 and sold in 1903.
- HMS Cyclops was repair ship, launched in 1905 as the merchant ship Indrabarah. She was used a fleet storage ship, and then submarine depot ship. She was scrapped in 1947.