Dufenal I (Nīwenglisc: Donald, Gaelisc: Domnall mac Ailpín (812 oð 13 Ēastermōnaþ 862) wæs Peohta cyning fram 858 oð 862. He folgede his brōþor Cenneþ Alpining (Cináed mac Ailpín) to Peohta rīce.