1965 U.S. National Championships (tennis)
| 1965 U.S. National Championships | |
|---|---|
| Date | 1 September – 12 September |
| Edition | 85th |
| Category | Grand Slam (ITF) |
| Surface | Grass |
| Location | Forest Hills, Queens New York, United States |
| Venue | West Side Tennis Club |
| Champions | |
| Men's singles | |
 Manuel Santana | |
| 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, United States. 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.
Champions
Men's Singles
Manuel Santana defeated 
Cliff Drysdale 6–2, 7–9, 7–5, 6–1
Women's Singles
Margaret Smith defeated Billie Jean Moffitt 8–6, 7–5
Men's doubles
Roy Emerson / Fred Stolle defeated Frank Froehling / Charles Pasarell 6–4, 10–12, 7–5, 6–3
Women's doubles
Carole Graebner / Nancy Richey defeated Billie Jean Moffitt / Karen Susman 6–4, 6–4
Mixed doubles
Margaret Smith / Fred Stolle defeated Judy Tegart / Frank Froehling 6–2, 6–2