Duncan Hamilton (30 April 1920 in Cork, County Cork, Ireland – 13 May 1994 in Sherborne, Dorset, England) was a British amateur racing driver. Born in County Cork, Ireland, he was educated at Brighton College. He flew Lysanders with the Fleet Air Arm in World War II and ran a garage.
He participated in five World Championship Grands Prix and 18 non-Championship Formula One races. His best results in the non-Championship events were fourth place in the 1948 Zandvoort Grand Prix with a Maserati 6CM, third in the 1951 Richmond Trophy (ERA B-Type), second in the 1951 BRDC International Trophy (Talbot-Lago T26C), third in the 1952 Richmond Trophy (Talbot-Lago T26C) and fourth in the 1952 Internationales ADAC Eifelrennen (HWM-Alta).