Thomas Daniel Calnan (1914- ) is an English pilot and POW of World War II, who wrote a memoir of his time in German captivity entitled Free As A Running Fox. Calnan was shot down while flying a Spitfire on a photoreconnaissance mission over France in December, 1941. He gives some brief background about himself and his flying career, but devotes most of the book to his escape attempts while a prisoner of the Germans. He was incarcerated at Stalag Luft III during the period of the "Great Escape."