The Blue Network (previously the NBC Blue Network) was the on-air name of a now defunct American radio network, which broadcast from 1927 through 1945.
Beginning as one of the two radio networks owned by the National Broadcasting Company (NBC), the independent Blue Network was born of a divestiture in 1942, arising from antitrust litigation. In 1943, the Blue Network formally became the American Broadcasting Company (ABC), but operated closely with NBC for another two years.