William Reilly may refer to: William K. Reilly (born 1940), Environmental Protection Agency administrator William L. Reilly (1916–2009), American Jesuit and academic William J. Reilly (1899–1970), American economist William Edward Moyses Reilly (1827–1886), British Army general William Arthur Reilly (1903–1969), American political figure from Boston Bill Reilly (William Francis Reilly, 1938–2008), American publishing and media executive Bill Reilly (runner) (William L. Reilly, born 1943), American steeplechase runner Will Reilly (born 2002), American soccer player Will Reilly (ice hockey) (born 1997), Canadian ice hockey player William K. Reilly, pseudonym used by English writer John Creasey (1908–1973)
See also William Riley (disambiguation) William O'Reilly (disambiguation)