HMS Leviathan was a Courageux Class, Third Rate, 74 gun ship of the line of the Common Type, built by the Royal Dockyard, Chatham.
HMS Leviathan was launched into the River Medway on Saturday, 9th October 1790. On completion, she was a ship of 1707 tons. She was 172ft 3in long on her upper gundeck and 47ft 10in wide across the beam.