1931 U.S. National Championships (tennis)
| 1931 U.S. National Championships | |
|---|---|
| Date | September 3–10 (M) August 15–20 (W) |
| Edition | 51st |
| Category | Grand Slam (ITF) |
| Surface | Grass / Outdoor |
| Location | Forest Hills, Queens New York City, New York |
| 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 City, New York. The tournament ran from September 3 until September 10. It was the 51st staging of the U.S. National Championships and the fourth Grand Slam tennis event of the year.