Thomas Guy Greenfield (November 10, 1917 – October 9, 2004) was a professional American football center/linebacker in the National Football League. Greenfield, who was born in Glendale, Arizona, played for the Green Bay Packers from 1939 to 1941. A member of the 1939 NFL Champion Packers, he played in the annual All-Star Game that year. He played college football at the University of Arizona, where he was a member of the Sigma Alpha Epsilon fraternity.