HMS Boscawan was a 70-gun third rate ship of the line of the Royal Navy, launched on 3 April 1844 at Woolwich Dockyard. She was originally ordered and begun as a 74-gun ship, but an Admiralty order dated 3 March 1834 required that she be reworked to Sir William Symonds' design. She was named for Admiral Edward Boscawen. In 1874, Boscawen was converted into a training ship and renamed Wellesley.[citation needed] She was broken up in 1914.