From BR Bullpen
|1903 in baseball|
|<< 1902 1904 >>|
Championships, events, culture, births, and deaths that occurred in 1903.
 Club competitions
 North America
- Major League Baseball
- Minor League Baseball
 Winter Leagues
- October 1 - The Pittsburgh Pirates of the National League defeat the Boston Americans of the American League, 7 - 3, in the first game in a modern World Series ever played.
- October 13 - In the decisive eighth game, the American League's Boston Americans win the first World Series over the National League's Pittsburgh Pirates.
- Further information: Births in 1903
- Further information: Deaths in 1903