Stanley Bagg "Bags" Pennock (June 15, 1892 – November 27, 1916) was an American football player. He was selected as a first-team All-American at the guard position three consecutive years while leading Harvard University to three undefeated seasons from 1912 to 1914. He was killed in 1916 in an explosion at a chemical plant in New Jersey. He was posthumously elected to the College Football Hall of Fame in 1954.