The Boston Red Sox, with 7. They won in 1903, 1912, 1915, 1916, 1918, 2004, and 2007.
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The New York Yankees have played in the most World Series games.
The New York Yankees with 27 World Series championships are the most in baseball.
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Yankees has the most world series win if that's what you mean. (27)
The New York Yankees have just recently won their 27th world series. That's the most amount won in the history of baseball!