HMS Magnanime was a 64-gun third-rate ship of the line of the Royal Navy, launched on 14 October 1780 at Deptford Dockyard. She belonged to the Intrepid-class designed by Sir John Williams and later was razeed into a 44 gun frigate.

A razee or razée is a sailing ship that has been cut down (razeed) to reduce the number of decks. The word is derived from the French vaisseau rasé, meaning a razed ship.