Robert Francis Callahan (September 26, 1923 – March 10, 2011) was an American football player. He was born in St. Louis, Missouri and attended Beaumont High School where he was the captain of the football and basketball teams. He played college football as a center for the University of Missouri in 1942, but his education was interrupted by two years in the United States Marine Corps during World War II. After being discharged from the Marines, Callahan played football as a tackle and center for the University of Michigan in 1945 and 1946.