1900 U.S. National Championships (tennis)

1900 U.S. National Championships
Date	August 13–21 (M) June 19–23 (W)
Edition	20th
Category	Grand Slam
Surface	Grass
Location	Newport, R.I., United States (M) Philadelphia, PA, United States (W)
Champions
Men's singles
Malcolm Whitman[1]
Women's singles
Myrtle McAteer[1]
Men's doubles
Holcombe Ward / Dwight Davis[1]
Women's doubles
Hallie Champlin / Edith Parker[1]
Mixed doubles
Margaret Hunnewell / Alfred Codman[1]
← 1899 · U.S. National Championships · 1901 →

List of champions of the 1900 U.S. National Championships tennis tournament (now known as the US Open). The men's tournament was held from August 13 to August 21 on the outdoor grass courts at the Newport Casino in Newport, Rhode Island. The women's tournament was held from June 19 to June 23 on the outdoor grass courts at the Philadelphia Cricket Club in Philadelphia, Pennsylvania. It was the 20th U.S. National Championships and the second Grand Slam tournament of the year.

Malcolm Whitman defeated William Larned 6–4, 1–6, 6–2, 6–2

Myrtle McAteer defeated Edith Parker 6–2, 6–2, 6–0

Holcombe Ward / Dwight Davis defeated Fred Alexander / Raymond Little 6–4, 9–7, 12–10

Hallie Champlin / Edith Parker defeated Marie Wimer / Myrtle McAteer 9–7, 6–2, 6–2

Margaret Hunnewell / Alfred Codman defeated T. Shaw / George Atkinson 11–9, 6–3, 6–1

• Official US Open website