The 1971 US Open was a tennis tournament that took place on the outdoor grass courts at the West Side Tennis Club in Forest Hills, Queens, in New York City, USA. The tournament ran from 1 September until 12 September. It was the 91st staging of the US Open, and the fourth Grand Slam tennis event of 1971.

Finals

Men's singles

🇺🇸 Stan Smith defeated Jan Kodeš, 3–6, 6–3, 6–2, 7–6(5–3)

Women's singles

🇺🇸 Billie Jean King defeated 🇺🇸 Rosemary Casals, 6–4, 7–6

Men's doubles

🇦🇺 John Newcombe / 🇬🇧 Roger Taylor defeated 🇺🇸 Stan Smith / 🇺🇸 Erik van Dillen, 6–7, 6–3, 7–6, 4–6, [5-3]

Women's doubles

🇺🇸 Rosemary Casals / 🇦🇺 Judy Tegart Dalton defeated 🇫🇷 Gail Chanfreau / 🇫🇷 Françoise Dürr, 6–3, 6–3

Mixed doubles

🇺🇸 Billie Jean King / 🇦🇺 Owen Davidson defeated Betty Stöve / Robert Maud, 6–3, 7–5

Seeded players

Men's singles

Prize money