The 1930 major league baseball season began on April 14, 1930. The regular season ended on September 28, with the St. Louis Cardinals and Philadelphia Athletics as the regular season champions of the National League and American League, respectively. The postseason began with Game 1 of the 27th World Series on October 1 and ended with Game 6 on October 8. The Athletics defeated the Cardinals, four games to two, capturing their fifth championship in franchise history, winning back-to-back World Series.
Offense dominated this season. The National League batted .303, with six teams batting better than .300. The American League came in at .288, with three teams batting over .300.