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O'Neil or O'Niel could refer to the following:
- O'Neil (Day 2) - a CTU agent active during Season 2
- O'Neil (The Game) - a terrorist mercenary working for Robert Daniels during The Game
- O'Niel - a member of the Prion Variant Cabal during Season 7
- James Joseph O'Neil - played Halcott in 24: Redemption
- Michael O'Neill - played Richard Walsh in Season 1