| 1946 U.S. National Championships | |
|---|---|
| Date | August 31 – September 8 | 
| Edition | 66th | 
| Category | Grand Slam (ILTF) | 
| Surface | Grass / outdoor | 
| Location | Forest Hills, Queens New York City, United States | 
| Venue | West Side Tennis Club | 
| Champions | |
| Men's singles | |
| .svg.png.webp) Jack Kramer | |
| Women's singles | |
| .svg.png.webp) Pauline Betz Addie | |
| Men's doubles | |
| .svg.png.webp) Gardnar Mulloy / .svg.png.webp) Bill Talbert | |
| Women's doubles | |
| .svg.png.webp) Louise Brough / .svg.png.webp) Margaret Osborne | |
| Mixed doubles | |
| .svg.png.webp) Margaret Osborne / .svg.png.webp) Bill Talbert | |
The 1946 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 August 31 until September 8. It was the 66th staging of the U.S. National Championships, and the fourth Grand Slam tennis event of the year.[1]
Finals
Men's singles
.svg.png.webp) Jack Kramer defeated
 Jack Kramer defeated .svg.png.webp) Tom Brown Jr.  9–7, 6–3, 6–0
 Tom Brown Jr.  9–7, 6–3, 6–0
Women's singles
.svg.png.webp) Pauline Betz defeated
 Pauline Betz defeated .svg.png.webp) Doris Hart  11–9, 6–3
 Doris Hart  11–9, 6–3
Men's doubles
.svg.png.webp) Gardnar Mulloy /
 Gardnar Mulloy / .svg.png.webp) Bill Talbert defeated
 Bill Talbert defeated .svg.png.webp) Frank Guernsey /
 Frank Guernsey / .svg.png.webp) Don McNeill 3–6, 6–4, 2–6, 6–3, 20–18 [2]
 Don McNeill 3–6, 6–4, 2–6, 6–3, 20–18 [2]
Women's doubles
 Louise Brough /
 Louise Brough /  Margaret Osborne defeated
 Margaret Osborne defeated  Patricia Todd /
 Patricia Todd /  Mary Arnold Prentiss 6–1, 6–3 [3]
 Mary Arnold Prentiss 6–1, 6–3 [3]
Mixed doubles
.svg.png.webp) Margaret Osborne /
 Margaret Osborne /  .svg.png.webp) Bill Talbert defeated
 Bill Talbert defeated  Louise Brough /
 Louise Brough /  Robert Kimbrell 6–3, 6–4 [4]
 Robert Kimbrell 6–3, 6–4 [4]