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.

The Boston Reds were a 19th-century baseball team located in Boston, Massachusetts that played in the Players' League in 1890 and in the American Association in 1891. They played in the Congress Street Grounds in the 1890s. The team took its name from the successful Boston club of the National Association and National League often known as the (Boston) Red Stockings. The club lasted only two seasons, but in those two seasons they were league champions.