The 1911 major league baseball season began on April 12, 1911. The regular season ended on October 12, with the New York Giants and Philadelphia Athletics as the regular season champions of the National League and American League, respectively. The postseason began with Game 1 of the eighth modern World Series on October 14 and ended with Game 6 on October 26. The Athletics defeated the Giants, four games to two.

The 1911 World Series was the championship series in Major League Baseball for the 1911 season. The eighth edition of the World Series, it matched the American League (AL) champion Philadelphia Athletics against the National League (NL) champion New York Giants. The Athletics won the best-of-seven series four games to two, in a rematch of the 1905 World Series, getting revenge over the Giants, who had won in their previous meeting.