Rockford Forest Citys (officially the Forest City Club), from Rockford, Illinois was one of the first professional baseball clubs. Rockford played for one season during the National Association inaugural year of 1871. They are not to be confused with Cleveland's Forest City club in the same league.
From 1868 to 1870, future Hall of Famer Albert Spalding and infielder Ross Barnes starred for Rockford while the club was still considered an 'amateur' team. In reality, the Forest Citys were one of the first ball clubs to pay players. Rockford played their home games at the Agricultural Society Fair Grounds.