Captain Harold Albert Kullberg (10 September 1896 – 5 August 1924) was a World War I flying ace credited with 19 aerial victories.

Though he scored his victories with the Royal Air Force, Kullberg was an American citizen.

August and September brought his final five victories, all over German Fokker D.VIIs.

The wingmen of his final victory on 16 September 1918 pursued him and inflicted three leg wounds on him.

On 3 November 1923, Kullberg chased down someone who was stunt flying over an urban area, landed with them, and arrested them.