Bronislau "Bronko" Nagurski (November 3, 1908 – January 7, 1990) was a Canadian-born American football player. He was also a successful professional wrestler, recognized as a multiple-time world heavyweight champion.
Nagurski turned professional to play for the Chicago Bears from 1930 to 1937. At 6 feet 2 inches (1.88 m) and 235 pounds (107 kg), he would have been a formidable presence in any era of the NFL, and in his day he was a dominant force in the league, helping the Bears win several division titles and two NFL championships.
Nagurski has the largest recorded NFL Championship ring size at 19½ and wore a size 8 helmet. He was probably the largest running back of his time, bigger than most linemen of the day, and a forerunner to large fullbacks like Marion Motley, John Henry Johnson, Jim Brown, often dragging multiple tacklers with him.