The 1957 U.S. National Championships (now known as the US Open) was a tennis tournament that took place on the outdoor grass courts at the West Side Tennis Club, Forest Hills in New York City, United States. The tournament ran from 30 August until 8 September. It was the 77th staging of the U.S. National Championships, and the fourth Grand Slam tennis event of the year.
See main article: 1957 U.S. National Championships – Men's singles. 
Malcolm Anderson (AUS) defeated Ashley Cooper (AUS) 10–8, 7–5, 6–4
See main article: 1957 U.S. National Championships – Women's singles. 
Althea Gibson (USA) defeated Louise Brough (USA) 6–3, 6–2
Ashley Cooper (AUS) / Neale Fraser (AUS) defeated Gardnar Mulloy (USA) / Budge Patty (USA) 4–6, 6–3, 9–7, 6–3 [1]
Louise Brough (USA) / Margaret Osborne duPont (USA) defeated Althea Gibson (USA) / Darlene Hard (USA) 6–2, 7–5 [2]
Althea Gibson (USA) / Kurt Nielsen (DEN) defeated Darlene Hard (USA) / Bob Howe (AUS) 6–3, 9–7 [3]