William Osborne or Osborn may refer to:Bill Osborne, New Zealand rugby player Qwominer William Osborne, British Virgin Islands politician Will Osborne (rugby) (1875–?), Welsh rugby player Will Osborne (singer) (1905–1981), Canadian singer William Osborne (umpire), National League umpire in 1876 William Osborne (writer), English writer William Alexander Osborne (1873–1967), Australian professor of Physiology William G. Osborne in District Attorney's Office v. Osborne, a U.S. Supreme Court case William H. Osborne, president and CEO of Federal Signal Corporation Sir William Osborne, 8th Baronet, Irish baronet and politician William Osborn (1837–1887), American soldier William A. Osborn, American bank executive William Church Osborn (1862–1951), New York State Democratic Committee Chairman William H. Osborn (1821–1894), American railroad tycoon William Evelyn Osborn (1868–1906), British artist