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 through part of the 1914 season. That stretch of 43 1/2 seasons is still the longest tenure of the Braves club at any of their various ballparks and cities since 1914.