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, USA. The tournament ran from 31 August until 8 September. It was the 66th staging of the U.S. National Championships, and the fourth Grand Slam tennis event of the year.
Jack Kramer defeated Tom Brown Jr. 9–7, 6–3, 6–0
Pauline Betz Addie defeated Patricia Canning Todd 11–9, 6–3
Gardnar Mulloy / Bill Talbert defeated Don McNeill / Frank Guernsey 3–6, 6–4, 2–6, 6–3, 20–18 
Louise Brough / Margaret Osborne defeated Patricia Todd / Mary Arnold Prentiss 6–1, 6–3 
Margaret Osborne / Bill Talbert defeated Louise Brough / Robert Kimbrell 6–3, 6–4 
- ^ Collins, Bud (2010). The Bud Collins History of Tennis (2nd ed.). [New York]: New Chapter Press. pp. 82–84. ISBN 978-0942257700.
- ^ Collins, p. 477
- ^ Collins, p. 480
- ^ Collins, p. 482