Arthur James "Fatso" Donovan Jr., was an American professional football player who was a defensive tackle for three National Football League (NFL) teams, primarily the Baltimore Colts. He played college football for the Boston College Eagles. He was inducted into the Pro Football Hall of Fame in 1968.

The Baltimore Colts were a professional American football team that played in Baltimore from 1953 to 1983, when owner Robert Irsay moved the franchise to Indianapolis. The team was named for Baltimore's history of horse breeding and racing. It was the second incarnation of the Baltimore Colts, the first having played for three years in the All-America Football Conference and one in the National Football League (NFL). This Baltimore Colts played their home games at Memorial Stadium.