<P> In the American League , the New York Yankees have played in 40 World Series and won 27 , the Philadelphia / Kansas City / Oakland Athletics have played in 14 and won 9 , and the Boston Red Sox have played in 12 and won 8 , including the first World Series . In the National League , the St. Louis Cardinals have appeared in 19 and won 11 , the New York / San Francisco Giants have played in 20 and won 8 , the Brooklyn / Los Angeles Dodgers have appeared in 19 and won 6 , and the Cincinnati Reds have appeared in 9 and won 5 . </P>
who has won the most world series in baseball
New York Yankees