| 1883 MLB season | |
|---|---|
| League | American Association (AA) National League (NL) |
| Sport | Baseball |
| Duration | May 1 – September 30, 1883 (AA) May 1 – September 29, 1883 (NL) |
| Number of games | 98 |
| Number of teams | 16 (8 in each league) |
| Pennant winner | |
| AA champions | Philadelphia Athletics |
| AA runners-up | St. Louis Browns |
| NL champions | Boston Beaneaters |
| NL runners-up | Chicago White Stockings |
The 1883 Major League baseball season was contested from May 1 through September 30, 1883. It was the second season for the American Association (AA) and eighth season for the National League (NL). The Philadelphia Athletics won the AA pennant, while the Boston Beaneaters won the NL pennant. There was no postseason, although there was a canceled exhibition series between the two pennant winners.
Prior to the season, the Troy Trojans and Worcester Worcesters of the National League folded. In its place, the league enfranchised two teams: the New York Gothams and Philadelphia Quakers (today's San Francisco Giants and Philadelphia Phillies). It was decided that the six-team American Association would expand to eight teams and saw the minor league New York Metropolitans join and the enfranchisement of the Columbus Buckeyes.
Prior to the season, the Boston Red Caps and St. Louis Brown Stockings renamed as the Boston Beaneaters and St. Louis Browns, respectively.
The American Association and the National League, along with the Northwestern League, sign the Tripartite Agreement (also known as the National Agreement). This agreement binds the leagues to respect each other's valid player contracts as well as increasing the size of the reserve list from 6 to 11 players.