| 1905 U.S. National Championships | |
|---|---|
| Date | August 22–31 (M) June 20–24 (W) |
| Edition | 25th |
| Category | Grand Slam |
| Surface | Grass |
| Location | Newport, R.I., United States (M) Philadelphia, PA, United States (W) |
| Champions | |
| Men's singles | |
 Beals Wright [1] | |
| Women's singles | |
| Elisabeth Moore[1] | |
| Men's doubles | |
| Holcombe Ward / Beals Wright[1] | |
| Women's doubles | |
| Helen Homans / Carrie Neely[1] | |
| Mixed doubles | |
| Augusta Schultz / Clarence Hobart[1] | |
List of champions of the 1905 U.S. National Championships tennis tournament (now known as the US Open). The men's tournament was held from August 22 to August 31 on the outdoor grass courts at the Newport Casino in Newport, Rhode Island. The women's tournament was held from June 20 to June 24 on the outdoor grass courts at the Philadelphia Cricket Club in Philadelphia, Pennsylvania. It was the 25th U.S. National Championships and the second Grand Slam tournament of the year.