O'Donnell is a surname. It may possibly refer to the following:
In the Halo Universe
- Lance O'Donnell: The famous Earth socialite.
In the real world
- Martin O'Donnell: A sound director at Bungie Studios.
- Bob O'Donnell: The voice actor for the Prophet of Objection in Halo 2, as well as the voice of the Terminals in Halo: Reach.
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