| 1956 U.S. National Championships | |
|---|---|
| Date | 31 August – 9 September |
| Edition | 76th |
| Category | Grand Slam (ILTF) |
| Surface | Grass |
| Location | Chestnut Hill, Massachusetts Forest Hills, Queens, New York City United States |
| Venue | Longwood Cricket Club West Side Tennis Club |
| Champions | |
| Men's singles | |
.svg.png.webp){kind=small} Ken Rosewall[1] | |
| Women's singles | |
 Shirley Fry | |
| Men's doubles | |
| Lew Hoad / Ken Rosewall | |
| Women's doubles | |
| Louise Brough / Margaret Osborne duPont | |
| Mixed doubles | |
| Margaret Osborne duPont / Ken Rosewall | |
The 1956 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 31 August until 9 September. It was the 76th staging of the U.S. National Championships, and the fourth Grand Slam tennis event of the year.
Finals
Men's singles
Ken Rosewall (AUS) defeated Lew Hoad (AUS) 4–6, 6–2, 6–3, 6–3
Women's singles
Shirley Fry (USA) defeated Althea Gibson (USA) 6–3, 6–4
Men's doubles
Lew Hoad (AUS) / Ken Rosewall (AUS) defeated Ham Richardson (USA) / Vic Seixas (USA) 6–2, 6–2, 3–6, 6–4 [2]
Women's doubles
Louise Brough (USA) / Margaret Osborne (USA) defeated Shirley Fry (USA) / Betty Pratt (USA) 6–3, 6–0 [3]
Mixed doubles
Margaret Osborne (USA) / Ken Rosewall (AUS) defeated Darlene Hard (USA) / Lew Hoad (AUS) 9–7, 6–1 [4]