World Series Winners
The New York Yankees (of the American League) have played in 40 of the 113 World Series and have won 27 (see the full list of past winners of the World Series).
As well as holding the record for the most Wold Series Championships won, the New York Yankees also have had the most World Series losses. Considering this stat, it is also not surprising that they also have had the most World Series appearances by any Major League Baseball team.
The following teams have never won a World Series: Brooklyn Robins, Colorado Rockies, Milwaukee Brewers, Montreal Expos, Seattle Mariners, Tampa Bay Devil Rays, Texas Rangers, San Diego Padres, Seattle Pilots and the St. Louis Browns. Maybe next year.