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]
← 1904 · U.S. National Championships · 1906 →

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.

Beals Wright (USA) defeated Holcombe Ward (USA) 6–2, 6–1, 11–9

Elisabeth Moore (USA) defeated Helen Homans (USA) 6–4, 5–7, 6–1

Holcombe Ward (USA) / Beals Wright (USA) defeated Fred Alexander (USA) / Harold Hackett (USA) 6–4, 6–4, 6–4

Helen Homans (USA) / Carrie Neely (USA) defeated Marjorie Oberteuffer (USA) / Virginia Maule (USA) 6–0, 6–1

Augusta Schultz (USA) / Clarence Hobart (USA) defeated Elisabeth Moore (USA) / Edward Dewhurst (USA) 6–2, 6–4

• Official US Open website