The name O'Neill could refer to the following people/ship:
- Charlie O'Neill - The deceased son of Jack O'Neill and Sara O'Neill.
- Jack O'Neill - SG-1's first leader and now Commander of Homeworld Command.
- Jack O'Neill's from alternate realities
- Jack O'Neill's from alternate timelines
- Jack O'Neill (clone) - The Asgard duplicate/clone of Jack O'Neill.
- Jack O'Neill (Unity) - The Crystal duplicate of Jack O'Neill.
- Jack O'Neill (android) - The Android duplicate of Jack O'Neill.
- Jade O'Neill - The daughter of Jack O'Neill from an alternate timeline.
- O'Neill-class ship - Asgard class warships named after Jack O'Neill.
- O'Neill's cabin
- Samantha O'Neill - The wife of Jack O'Neill from an alternate reality.
- Sara O'Neill - Jack O'Neill's ex-wife.
- O'Neill - Asgard class warship named after Jack O'Neill.
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