The 1890 Buffalo Bisons baseball team was a member of the short lived Players' League, and an "outlaw" franchise that used the name of the existing minor league Buffalo Bisons without permission. The Players' League Buffalo Bisons compiled a 36–96 record, which landed them in last place, 46½ games behind the pennant-winning Boston Reds and 20 games behind the seventh-place Cleveland Infants in the eight-team league. After the season, the league folded, as did the team and the stadium continued to home field for their International League rival Bisons.

The 1890 Boston Reds baseball team was a member of the short-lived Players' League. They compiled an 81–47 record and won the league championship. After the season, the league folded, but the Reds were invited to join the American Association for the following season and folded after a single season with players dispersed to other AA teams.