1886 Major League Baseball season
| 1886 MLB season | |
|---|---|
| League | American Association (AA) National League (NL) |
| Sport | Baseball |
| Duration | Regular season:
|
| Number of games | 140 (AA) 126 (NL) |
| Number of teams | 16 (8 per league) |
| Pennant winner | |
| AA champions | St. Louis Browns |
| AA runners-up | Pittsburgh Alleghenys |
| NL champions | Chicago White Stockings |
| NL runners-up | Detroit Wolverines |
| World's Championship Series | |
| Champions | St. Louis Browns |
| Runners-up | Chicago White Stockings |
The 1886 major league baseball season began on April 17, 1886. The regular season ended on October 15, with the Chicago White Stockings and the St. Louis Browns as regular season champions of the National League and American Association, respectively. The postseason began with Game 1 of the third World's Championship Series on October 18 and ended with Game 6 on October 23, in what was a best-of-seven-playoff. The Browns defeated the White Stockings, four games to two, capturing their first World's Championship Series.
Over the offseason, the National League's Buffalo Bisons transfer into the minor league International League and Providence Grays fold. The two open spots are filled by the newly enfranchised Kansas City Cowboys and Washington Nationals.