HMS Lion was a 64-gun third-rate ship of the line of the Royal Navy, of the Worcester class, launched on 3 September 1777 at Portsmouth Dockyard.

The Battle of Grenada took place on 6 July 1779 during the American Revolutionary War in the West Indies between the British Royal Navy and the French Navy, just off the coast of Grenada. The British fleet of Admiral John Byron had sailed in an attempt to relieve Grenada, which the French forces of the Comte D'Estaing had just captured.