The 1948 All-American Girls Professional Baseball League season marked the sixth season of the circuit. The AAGPBL grew to an all-time peak of ten teams in that season, representing Eastern and Western zones, just in the first year the circuit shifted to strictly overhand pitching. Other modifications occurred during 1948. The ball was decreased in size from 11½ inches to 10⅜ inches, while the base paths were lengthened to 72 feet and the pitching distance increased to 50 feet.