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Harold may refer to:
- Harold - An FEV mutant (eventually a part-tree) who has appeared in Fallout, Fallout 2, Fallout 3, and Fallout: Brotherhood of Steel
- Harold - ...... Fallout Tactics.
- Harold Callahan - Mentioned-only U.S. Army trooper in the pre-War Pentagon in Broken Steel
- Harold Worthington III - Mentioned-only visitor of the Statesman Hotel in Fallout 3