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.

Finals

Men's singles

🇦🇺 Malcolm Anderson (AUS) defeated 🇦🇺 Ashley Cooper (AUS) 10–8, 7–5, 6–4

Women's singles

🇺🇸 Althea Gibson (USA) defeated 🇺🇸 Louise Brough (USA) 6–3, 6–2

Men's doubles

🇦🇺 Ashley Cooper (AUS) / 🇦🇺 Neale Fraser (AUS) defeated 🇺🇸 Gardnar Mulloy (USA) / 🇺🇸 Budge Patty (USA) 4–6, 6–3, 9–7, 6–3

Women's doubles

🇺🇸 Louise Brough (USA) / 🇺🇸 Margaret Osborne duPont (USA) defeated 🇺🇸 Althea Gibson (USA) / 🇺🇸 Darlene Hard (USA) 6–2, 7–5

Mixed doubles

🇺🇸 Althea Gibson (USA) / Kurt Nielsen (DEN) defeated 🇺🇸 Darlene Hard (USA) / 🇦🇺 Bob Howe (AUS) 6–3, 9–7