1934 Major League Baseball season

The 1934 major league baseball season began on April 17, 1934. The regular season ended on September 30, with the St. Louis Cardinals and Detroit Tigers as the regular season champions of the National League and American League, respectively. The postseason began with Game 1 of the 31st World Series on October 3 and ended with Game 7 on October 9. The Cardinals then defeated the Tigers, four games to three, capturing their third championship in franchise history, since their previous in 1931. Going into the season, the defending World Series champions were the New York Giants from the 1933 season.

The second All-Star Game was held on July 10 at the Polo Grounds in New York, New York, home of the New York Giants. The American League won, 9–7.