The Capitoline Grounds, also known as Capitoline Skating Lake and Base Ball Ground, was a baseball park located in Brooklyn, New York from 1864 to 1880. It was built to rival nearby Union Grounds, also in Brooklyn. The park hosted local amateur teams in its early history, but later hosted professional and semi-professional games. The park's only season as the home field for an all-professional team occurred in 1872 when the Brooklyn Atlantics joined the National Association of Professional Base Ball Players. The park was flooded during the winter and used as an ice skating park.