The Union of Morrisania (founded 17 July 1855, South Bronx, New York, United States) was a baseball team which played in the National Association of Base Ball Players league.
This encouraged the team and in the 1865 season, they placed third in the league with thirteen wins and ten losses.
In 1869, new professional baseball teams such as the Cincinnati Red Stockings entered the league.
After the 1870 season, Union refused to enter the new National Association of Professional Base Ball Players.
The National Association of Base Ball Players was dissolved, and two years later, in 1873, the Union team disbanded.