HMS Trusty was a 50-gun fourth-rate ship of the line of the Royal Navy.

Like Cato, she featured the beakhead bulkhead, roundhouse with gallery, and solid bulwarks along the quarterdeck.

The large roundhouse was surmounted by further solid bulwarks into which a fourth tier of gunports was cut for the carronades mounted on the poopdeck.

Trusty was at Plymouth on 20 January 1795 and so shared in the proceeds of the detention of the Dutch naval vessels, East Indiamen, and other merchant vessels that were in port on the outbreak of war between Britain and the Netherlands.

Because she served in the Navy's Egyptian campaign (8 March – 2 September 1801), her officers and crew qualified for the "Egypt" clasp to the Naval General Service Medal, which the Admiralty issued in 1847 to all surviving claimants.