William Ryder

William Ryder may refer to:
 * William Ryder (rugby union) (born 1982), Fijian rugby union footballer
 * William T. Ryder (1913–1992), first American paratrooper, later a brigadier general
 * William Ryder (mayor) (died 1611), Lord Mayor of London
 * William Ryder (MP) (died 1432/33), MP for Totnes