William Hadley

William Hadley may refer to:


 * William A. Hadley (1860–1941), founder of Hadley school for the blind, Illinois, USA
 * William F. L. Hadley (1847–1901), American congressman
 * William M. Hadley (1917–1992), American educator
 * Bill Hadley (rugby union) (1910–1992), New Zealand rugby union player
 * William Sheldon Hadley (1859–1927), British academic