Jack O'Neill (disambiguation)
Jack O'Neill is a fictional character in the Stargate film and television series.
Jack O'Neill or O'Neil may also refer to:
- Jack [O'Neill (baseball)], Irish-American baseball player
- Jack O'Neill (businessman), American surfer and businessman, founder of O'Neill, the surfwear and equipment brand
- Jack O'Neill (statistician), Australian public servant
- Jack O'Neil (swimmer), American Paralympic swimmer
- Jack O'Neill, American rock musician, member of Jackopierce