Stefan Stanisław Stec (November 21, 1893 - May 11, 1921) was a Polish aviator and military pilot, one of the pioneers of Polish aviation. He is also credited as the originator of the Polish Air Force checkerboard. From 1916 he initially served as an observer in the Flik 3 reconnaissance squadron on the eastern front. In February 1918 he trained as a pilot and from May he was assigned to the Flik 3J fighter squadron, flying the Oeffag D.III on the Austro-Italian front. Between June 17 and July 4 he commanded Flik 9J. He participated in shooting down 3 aircraft (plus 4 probable kills) and ended