The 1939 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 7 September until 17 September. It was the 59th staging of the U.S. National Championships and the fourth Grand Slam tennis event of the year.
Bobby Riggs defeated Welby van Horn 6–4, 6–2, 6–4
Alice Marble defeated Helen Jacobs 6–0, 8–10, 6–4
Adrian Quist / John Bromwich defeated Jack Crawford / Harry Hopman 8–6, 6–1, 6–4 
Sarah Palfrey Cooke / Alice Marble defeated Kay Stammers / Freda Hammersley 7–5, 8–6 
Alice Marble / Harry Hopman defeated Sarah Palfrey Cooke / Elwood Cooke 9–7, 6–1 
- ^ Collins, Bud (2010). The Bud Collins History of Tennis (2nd ed.). [New York]: New Chapter Press. pp. 64–66. ISBN 978-0942257700.
- ^ Collins, p. 477
- ^ Collins, p. 479
- ^ Collins, p. 482