The Baltimore Monumentals were an American baseball team in the short-lived Union Association.
Their top-hitting regular was left fielder Emmett Seery, who batted .311 with a slugging percentage of .408, and their ace pitcher was Bill Sweeney, who was 40–21 with an earned run average of 2.59, and pitched 538 of the team's 946 innings.
On July 4, 1884, Baltimore played a split double header against the Cincinnati Outlaw Reds and the run-away league leaders, the St. Louis Maroons, which saw a sellout crowd in attendance.
The field also hosted a home game for the traveling Chicago Browns team.
The team did play one game on August 25, 1884 at the larger Madison Avenue Ground, in a win against the Washington Nationals.