Charles O'Neill

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