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Harold may refer to:
- Harold, an FEV mutant (eventually consumed and symbiotically fused with a tree) who has appeared in Fallout, Fallout 2, Fallout 3 and Fallout: Brotherhood of Steel.
- Harold Worthington III, a visitor of the Statesman Hotel mentioned in Fallout 3.
- Harold Callahan, a US Army trooper in the Pentagon before the Great War, mentioned in the Fallout 3 add-on, Broken Steel.
- Harold, a ghoul recruit and member of the Brotherhood of Steel in Fallout: Tactics.
- Real life person: