Madison Avenue Grounds was a baseball ground located in Baltimore, Maryland. It was built by the Waverly Club as the first enclosed ballpark in Baltimore, with spectator seating and player clubhouses, and was the site of the first intercity game played in Baltimore (Brooklyn Excelsiors 51, Baltimore Excelsiors 6) on September 22, 1860; it was the site of a 47-7 defeat of the local Marylands by the undefeated Cincinnati Red Stockings in 1869, and it was used by the Washington Olympics for a professional game in 1871. On August 16, 1870, it was the site of an intercity game between black teams.