William O'Reilly or Bill O'Reilly may refer to: 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 Bill O'Reilly (cricketer) (1905–1992), Australian cricketer Bill O'Reilly (political commentator) (born 1949), American commentator, author and former television host William F. B. O'Reilly (born 1963), American political consultant See also William Riley (disambiguation)