William O'Reilly or Bill O'Reilly may refer to:Bill O'Reilly (cricketer) (1905–1992), Australian cricketer Bill O'Reilly, American commentator, author and television host William O'Reilly (MP) (1792–1844), UK MP for the Irish constituency of Dundalk, 1832–1835 William O'Reilly (educator) (1864–1937), Irish educator William Edmund O'Reilly (1873–1934), British diplomat William F. B. O'Reilly, American political consultant