Most World Series Championships, The World Series is the annual championship series of Major League Baseball (MLB). It was the highest level of professional baseball in the United States and Canada since 1903, finishing the postseason in the majors. The World Series is played between the club champions of the American League and National League from 2009 that collectively include 29 clubs based in the United States and one club from Canada, whose lists include players from around the world. The modern World Series has been played every year since 1903, with the exception of 1904 which was canceled when the National League champion New York Giants refused to play the American League champion Boston Americans, and 1994, that was canceled due to strike MLB .

Baseball has employed various championship formulas since the 1860s. When the term “World Series” is used by itself, is usually refer to the “modern” World Series exclusively. The World Series championship is determined through a best of seven playoff games. To the best of seven format has been the modern world all series except 1903, 1919, 1920 and 1921, when the winner was determined through a best of nine playoff. The winner of the series is awarded the World Series trophy, as well as individual World Series rings.

New York Yankees American League have played in 40 of the Series 104 to 2009 and have won 26 World Series championships the most of any major league franchise, and exactly one quarter of all Series titles World livestock to date. With his frequent appearances in the Fall Classic, the Yankees have lost more in the series (13) than any other club. For the NL, the Dodgers have appeared in the series of more than 18 times (9 each in Brooklyn and Los Angeles), but have won the Series only 6 times (once in Brooklyn, five times more than Los Angeles ). The St. Louis Cardinals have represented the National League 17 times and have won 10 championships, which is second among major league teams. The Chicago Cubs have the longest streak of not winning the World Series, with their last championship coming in 1908 .