| 1926 U.S. National Championships | |
|---|---|
| Date | September 13–18 (M) August 16–23 (W) |
| Edition | 46th |
| Category | Grand Slam (ITF) |
| Surface | Grass |
| Location | Forest Hills, Queens New York City, United States |
| Venue | West Side Tennis Club |
| Champions | |
| Men's singles | |
 René Lacoste[1] | |
| Women's singles | |
 Molla Bjurstedt Mallory[1] | |
| Men's doubles | |
| Richard Norris Williams / Vincent Richards[2] | |
| Women's doubles | |
| Elizabeth Ryan / Eleanor Goss[3] | |
| Mixed doubles | |
| Elizabeth Ryan / Jean Borotra[4] | |
The 1926 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, United States. The women's tournament was held from August 16 until August 23 while the men's tournament ran from September 13 until September 18. It was the 46th staging of the U.S. National Championships and the fourth Grand Slam tennis event of the year.