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.

The American Association of Base Ball Clubs (AA) was a professional baseball league that existed for 10 seasons from 1882 to 1891. Together with the National League (NL), founded in 1876, the AA participated in an early version of the World Series seven times versus the champion of the NL in an interleague championship playoff tournament. At the end of its run, several AA franchises joined the NL. After 1891, the NL existed alone, with each season's champions being awarded the Temple Cup (1894–1897).