General O'Neil or O'Neill may refer to:
Archie E. O'Neil (1905–1986), U.S. Marine Corps brigadier general David F. O'Neill (1904–1963), U.S. Marine Corps major general Edward J. O'Neill (general) (1902–1979), U.S. Army lieutenant general Jack O'Neill fictional U.S. Air Force lieutenant general in Stargate media James Hugh O'Neill (1892–1972), U.S. Army brigadier general John E. O'Neil IV (fl. 1980s–2020s), U.S. Army brigadier general Joseph P. O'Neil (1863–1938), U.S. Army brigadier general Malcolm Ross O'Neill (born 1940), U.S. Army lieutenant general Mark J. O'Neil (born 1964), U.S. Army major general Owen Roe O'Neill (c. 1585–1649), Ulster Army general Ralph Ambrose O'Neill (1896–1980), Mexican American Air Force brigadier general