Theodore ("Theo") Hancock (November 16, 1923 – July 28, 1989) was a British-born, naturalised American, artist, working chiefly in watercolor. Theo's father was Major Reginald Hancock of Buckinghamshire, England. He was an official artist to NASA and their Apollo space programme in the 1960s as part of the NASA Art Program. He also undertook commissions for the United States Navy, including journeys at sea on Polaris nuclear submarines.