The 1943 major league baseball season began on April 20, 1943. The regular season ended on October 3, with the St. Louis Cardinals and New York Yankees as the regular season champions of the National League and American League, respectively. In a rematch of the prior year's postseason, the postseason began with Game 1 of the 40th World Series on October 5 and ended with Game 5 on October 11. The Yankees defeated the Cardinals, four games to one. The 11th Major League Baseball All-Star Game was played on July 13, hosted by the Philadelphia Athletics at the Shibe Park in Philadelphia, Pennsylvania, with the American League winning, 5–3. This was also the first All-Star Game held at night. In order to conserve rail transport during World War II, the 1943 spring training sites was limited to an area east of the Mississippi River and north of the Ohio River. Spring training sites included the Chicago White Sox in French Lick, Indiana; the Washington Senators in College Park, Maryland; and the Yankees in Asbury Park, New Jersey.

Schedule

The 1943 schedule consisted of 154 games for all teams in the American League and National League, each of which had eight teams. Each team was scheduled to play 22 games against the other seven teams of their respective league. This continued the format put in place since the season (except for ) and would be used until in the American League and in the National League. American League Opening Day took place on April 20 with a game between the Philadelphia Athletics and Washington Senators, while National League Opening Day took place on the following day, featuring four teams. This was the first season since that both leagues opened on different days. The final day of the regular season was on October 3, which saw all sixteen teams play, also the first time since. The World Series took place between October 5 and October 11.

Teams

An asterisk (*) denotes the ballpark a team played the minority of their home games at

Standings

American League

National League

Postseason

Bracket

<section begin=Bracket/> <section end=Bracket/>

Managerial changes

Off-season

In-season

League leaders

American League

National League

Awards and honors

Home field attendance