George M. "Potsy" Clark (March 20, 1894 – November 8, 1972) was an American football and baseball player, coach, and athletics administrator.

Clark was also the head coach of the National Football League's Portsmouth Spartans/Detroit Lions (1931–1936, 1940) and Brooklyn Dodgers (1937–1938), amassing a career NFL mark of 64–42–12.

[1] Clark's 1935 Detroit Lions team won the NFL Championship.

[2] As a member of the American Expeditionary Force (AEF) during World War I, Clark was a member of the U.S. Army's 89th Division's football team that won the AEF championship in March 1919.

[3] In a team with many college football stars, Charles Gerhardt played quarterback and Clark played left halfback under the direction of right guard, team captain and coach Paul Withington.