William Longespée, 3rd Earl of Salisbury (c. 1176 – 7 March 1226) ("Long Sword", Latinised to de Longa Spatha) was an Anglo-Norman nobleman, primarily remembered for his command of the English forces at the Battle of Damme and for remaining loyal to his half-brother, King John. His nickname "Longespée" is generally taken as a reference to his great physical height and the oversize weapons that he used.