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Three ships of the Royal Navy have borne the name HMS Gladiator, after the Gladiators of the ancient Roman Empire:
- HMS Gladiator (1783) was a fifth-rate ship of the line launched in 1783. She spent her entire career on harbour service, never once putting to sea. She was broken up in 1817.
- HMS Gladiator (1844) was a wood paddle frigate launched in 1844 and broken up in 1879.
- HMS Gladiator (1896) was an Arrogant-class second class protected cruiser, launched in 1896 and sunk on 25 April 1908 in a collision off the Isle of Wight.