Baseball is a popular and exciting team sport that is played by millions of people around the world. The game is played on a diamond-shaped field by two teams of nine players each, and the objective is to score points by hitting a ball with a bat and running around four bases.

The following is a list of the winning teams of the World Series, the annual championship of Major League Baseball, since its inception in 1903:

• New York Yankees (1923, 1927, 1928, 1932, 1936, 1937, 1938, 1939, 1941, 1943, 1947, 1949, 1950, 1951, 1952, 1953, 1956, 1958, 1961, 1962, 1977, 1978, 1996, 1998, 1999, 2000, 2009)
• St. Louis Cardinals (1926, 1931, 1934, 1942, 1944, 1946, 1964, 1967, 1968, 1982, 2006, 2011)
• Boston Red Sox (1903, 1912, 1915, 1916, 1918, 2004, 2007, 2013)
• San Francisco Giants (1905, 1921, 1922, 1933, 1954, 2010, 2012, 2014)
• Oakland Athletics (1910, 1911, 1913, 1929, 1930, 1972, 1973, 1974)
• Philadelphia/Kansas City/Oakland Athletics (1910, 1911, 1913, 1929, 1930, 1972, 1973, 1974)
• Chicago Cubs (1907, 1908, 2016)
• Baltimore/Washington Nationals (1969, 1970, 1979, 2012, 2019)
• Cincinnati Reds (1919, 1940, 1975, 1976)
• Toronto Blue Jays (1992, 1993)

Note: The World Series was not held in the years 1904-1918, 1994-1995, and 2020 due to various reasons.