1931 U.S. National Championships (tennis)
| 1931 U.S. National Championships | |
|---|---|
| Date | 3 September – 10 September (M) 15 August – 20 August (W) |
| Edition | 51st |
| Category | Grand Slam (ITF) |
| Surface | Grass / Outdoor |
| Location | Forest Hills, Queens New York, United States |
| Venue | West Side Tennis Club |
| Champions | |
| Men's singles | |
 Ellsworth Vines | |
| Women's singles | |
| Helen Wills Moody | |
| Men's doubles | |
| Wilmer Allison / John Van Ryn | |
| Women's doubles | |
 Betty Nuthall / Eileen Bennett Whittingstall | |
| Mixed doubles | |
| Betty Nuthall / George Lott | |
The 1931 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, United States. The tournament ran from 3 September until 10 September. It was the 51st staging of the U.S. National Championships and the fourth Grand Slam tennis event of the year.[1]
Champions
Men's Singles
Ellsworth Vines defeated George Lott 7–9, 6–3, 9–7, 7–5
Women's Singles
Helen Wills Moody defeated Eileen Bennett Whittingstall 6–4, 6–1
Men's doubles
Wilmer Allison / John Van Ryn defeated 
Gregory Mangin / Berkeley Bell 6–4, 8–6, 6–3 [2]
Women's doubles
Betty Nuthall / Eileen Bennett Whittingstall defeated Helen Jacobs / Dorothy Round 6–2, 6–4 [3]
Mixed doubles
Betty Nuthall / George Lott defeated Anna McCune Harper / Wilmer Allison 6–3, 6–3 [4]