Two ships of the Royal Navy have borne the name HMS Gladiolus, after the flower, the Gladiolus:
HMS Gladiolus was an Arabis class sloop launched in 1915. She was sold to the Portuguese Navy in 1920 and renamed Republica, where she served until c. 1943.
HMS Gladiolus was a Flower class corvette launched in 1940 and sunk in 1941.