The 1966 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 tournament ran from 1 September until 11 September. It was the 86th staging of the U.S. National Championships, and the fourth Grand Slam tennis event of 1966.
Finals
Men's singles
Fred Stolle defeated
John Newcombe 4–6, 12–10, 6–3, 6–4
Women's singles
Maria Bueno defeated
Nancy Richey 6–3, 6–1
Men's doubles
Roy Emerson /
Fred Stolle defeated
Clark Graebner /
Dennis Ralston 6–4, 6–4, 6–4 [2]
Women's doubles
Maria Bueno /
Nancy Richey defeated
Rosie Casals /
Billie Jean King 6–3, 6–4 [3]
Mixed doubles
Donna Floyd-Fales /
Owen Davidson defeated
Carol Hanks Aucamp /
Ed Rubinoff 6–1, 6–3 [4]