The National Stallion Stakes was an American Thoroughbred horse race for two-year-old fillies held annually for the twenty-four years between 1948 through 1971. It was created as a counterpart to the National Stallion Stakes which was first run in 1898 at Morris Park Racecourse and was open to horses of either sex until 1948 when it became a race exclusively for colts and geldings. Contested on dirt at a distance of five and one-half furlongs, the filly division was hosted by Belmont Park in Elmont, New York except for 1963 through 1967 when it was run at Aqueduct Racetrack in South Ozone Park, Queens, New York.