William Savile, 2nd Marquess of Halifax (1665 – 31 August 1700), was the son of George Savile, 1st Viscount Halifax and Dorothy Savile, Viscountess Halifax (née Spencer). He was educated in Geneva in 1677 and matriculated at Christ Church, Oxford, in 1681, but did not take a degree. He travelled on the continent in 1684–1687, returning on his brother's death. From that time, he was known as Lord Elland, from his father's subsidiary title of Baron Savile of Elland.
By his second wife, Lady Mary Finch, who was the first cousin of his first wife, daughter of Daniel Finch, 7th Earl of Winchilsea, whom he married on 2 April 1695
He died in 1700, at an early age from "an inward feavour". He died without male issue, so his peerages became extinct, but the baronetcy was inherited by a cousin.
Mark N. Brown, "Savile, George, first marquess of Halifax (1633–1695)", Oxford Dictionary of National Biography, Oxford University Press, Sept 2004; online edn, Oct 2009 [1], accessed 20 March 2010