| 1965 U.S. National Championships | |
|---|---|
| Date | 1 September – 12 September |
| Edition | 85th |
| Category | Grand Slam (ITF) |
| Surface | Grass |
| Location | Forest Hills, Queens New York City, New York |
| Venue | West Side Tennis Club |
| Champions | |
| Men's singles | |
 Manuel Santana [1] | |
| Women's singles | |
 Margaret Smith | |
| Men's doubles | |
| Roy Emerson / Fred Stolle | |
| Women's doubles | |
 Carole Caldwell Graebner / Nancy Richey | |
| Mixed doubles | |
| Margaret Smith / Fred Stolle | |
The 1965 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 1 September until 12 September. It was the 85th staging of the U.S. National Championships, and the fourth Grand Slam tennis event of 1965.
