The World Series is the annual championship series of Major League Baseball (MLB) in North America, contested since 1903 between the American League (AL) champion team and the National League (NL) champion. As of 2015, the World Series has been contested 111 times, with the AL winning 64 and the NL winning 47. The winner of the World Series championship is determined through a best-of-seven playoff and the winning team is awarded the Commissioner's Trophy.

The New York Yankees of the American League have won the most World Series with 27. The St. Louis Cardinals have won 11 World Series, second only to the Yankees, but the most of any National League Team.

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