William Prior

William Prior may refer to:


 * William Wain Prior (1876–1946), Danish general
 * William Prior (priest) (1883–1969), Anglican priest
 * William Matthew Prior (1806–1873), American folk artist
 * W. H. Prior (1812–1882), British painter and engraver
 * Billy Prior, a fictional character in Pat Barker's Regeneration Trilogy of novels