The 1923 U.S. National Championships (now known as the US Open) was a tennis tournament that took place on the outdoor grass courts at the Germantown Cricket Club in Philadelphia, Pennsylvania, United States. The women's tournament was held from August 13 until August 18 while the men's tournament ran from September 10 until September 15. It was the 43rd staging of the U.S. National Championships and the third Grand Slam tennis event of the year.
| 1923 U.S. National Championships | |
|---|---|
| Date | September 10–15 (M) August 13–18 (W) |
| Edition | 43rd |
| Category | Grand Slam (ITF) |
| Surface | Grass |
| Location | Philadelphia, Pennsylvania (MS) Forest Hills, New York (WS, WD) Chestnut Hill, Massachusetts (MD, XD) |
| Venue | Germantown Cricket Club (MS) West Side Tennis Club (WS, WD) Longwood Cricket Club (MD, XD) |
| Champions | |
| Men's singles | |
 Bill Tilden[1] | |
| Women's singles | |
| Helen Wills Moody[1] | |
| Men's doubles | |
Bill Tilden /  Brian Norton[2] | |
| Women's doubles | |
 Kitty McKane / Phyllis Howkins Covell[3] | |
| Mixed doubles | |
| Molla Bjurstedt Mallory / Bill Tilden[4] | |
Finals
editMen's singles
edit Bill Tilden defeated Bill Johnston 6–4, 6–1, 6–4
Women's singles
edit Helen Wills defeated Molla Mallory 6–2, 6–1
Men's doubles
edit Bill Tilden / Brian Norton defeated Richard Norris Williams / Watson Washburn 3–6, 6–2, 6–3, 5–7, 6–2
Women's doubles
edit Kitty McKane / Phyllis Howkins Covell defeated Hazel Hotchkiss Wightman / Eleanor Goss 2–6, 6–2, 6–1
Mixed doubles
edit Molla Mallory / Bill Tilden defeated Kitty McKane / 
John Hawkes 6–3, 2–6, 10–8