South End Grounds refers to any one of three baseball parks on one site in Boston, Massachusetts. They were home to the franchise that eventually became known as the Boston Braves, first in the National Association and later in the National League, from 1871 to 1914. The ballpark was across the New York, New Haven and Hartford Railroad tracks, to the south, from the eventual site of the Huntington Avenue Grounds, home to the Boston American League entry prior to the building of Fenway Park.