Six ships of the Royal Navy and one naval base have borne the name HMS Stag:
HMS Stag (1758) was a 32-gun Niger-classfrigate launched on 4 September 1758. She was reduced to a 28-gun sixth rate in 1777, but restored as a 32-gun fifth rate in 1779. She was broken up in July 1783 at Deptford.
HMS Stag (shore establishment) was the name used for the base for British naval personnel in Egypt. First established at Port Said, it commissioned 8 January 1940. There were outposts at Adabya, Kabrit, Ismailia, Generiffa, Port Tewfik and Haifa in Palestine. It was paid off in May 1949.