Charles O'Neill may refer to: Charles O'Neill (musician) (1882–1964), Canadian bandmaster, composer, organist, cornetist, and music educator Charles O'Neill (Pennsylvania politician) (1821–1893), U.S. Representative from Pennsylvania Charles O'Neill (engineer) (1828–1900), Australasian philanthropist and politician Charles H. O'Neill (1800–1897), U.S. politician Charles O'Neill, 1st Earl O'Neill (1779–1841), Irish politician, peer and landowner Charles O'Neill (Irish nationalist politician) (1849–1918), Member of Parliament for South Armagh, 1909–1918
See also Charles O'Neal Charles O'Neil