The New York Yankees have won the World Series 27 times and appeared 40 times.
The St. Louis Cardinals are second in World Series wins with 11.
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Through the 2008 season, that would be the Brooklyn/Los Angeles Dodgers with 21. The New York/San Francisco Giants are second with 20.
The New York Yankees have won the most World Series titles in the Major Leagues.
Through the 2011 season, the Dodgers and Giants are tied for most NL pennants with 21.