William Ryan may refer to: William Fitts Ryan (1922–1972), congressman from New York William H. Ryan (1860–1939), U.S. Representative from New York and Abbeyland William H. Ryan Jr., former Delaware County District Attorney and acting Pennsylvania Attorney General William Ryan (53rd Congress) (1840–1925), represented New York's 16th District in the Fifty-third United States Congress William Ryan (Irish politician) (1921–1994), Irish Fianna Fáil politician, senator 1961–1989 William Ryan (film director), director of Reach the Rock and Flubber William Ryan (geologist), proponent of the Black Sea deluge theory William Ryan (psychologist) (c. 1924–2002), author of the 1971 book Blaming the Victim William Ryan (sailor) (born 1988), Australian sailor William Ryan (Canadian politician) (1887–1938), Canadian Member of Parliament William Ryan (footballer), English professional footballer who played as a goalkeeper William Patrick Ryan (1867–1942), Irish author and journalist William F. Ryan (1907–1954), American checkers player William A. Ryan (1919–2001), politician from Michigan William B. Ryan (1908-1975), American politician, lawyer, and judge