The 1948 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 10 September until 19 September. It was the 68th staging of the U.S. National Championships, and the fourth Grand Slam tennis event of the year.
Pancho Gonzales defeated Eric Sturgess 6–2, 6–3, 14–12
Margaret Osborne duPont defeated Louise Brough Clapp 4–6, 6–4, 15–13
Gardnar Mulloy / Bill Talbert defeated Frank Parker / Ted Schroeder 1–6, 9–7, 6–3, 3–6, 9–7 
Louise Brough / Margaret Osborne defeated Patricia Todd / Doris Hart 6–4, 8–10, 6–1 
Louise Brough / Tom Brown defeated Margaret Osborne duPont / Bill Talbert 6–4, 6–4 
- ^ Collins, Bud (2010). The Bud Collins History of Tennis (2nd ed.). [New York]: New Chapter Press. pp. 86–88. ISBN 978-0942257700.
- ^ Collins, p. 477
- ^ Collins, p. 480
- ^ Collins, p. 482