Marion Sylvester Barber III (born June 10, 1983) is a former American football running back in the National Football League. After playing college football for the Minnesota Golden Gophers, he was drafted by the Dallas Cowboys in the fourth round of the 2005 NFL Draft. He was selected to the Pro Bowl in 2007 during his six-year tenure with the Cowboys. He played for the Chicago Bears in 2011. 