The 1977 US Open was a tennis tournament that took place on the outdoor clay courts at the West Side Tennis Club in Forest Hills, Queens, in New York City, United States. The tournament ran from 29 August until 11 September. It was the 97th staging of the US Open, and the fourth Grand Slam tennis event of 1977. This was the third and final year in which the US Open was played on clay courts. After 68 years it was the final time the championship was played at the West Side Tennis Club in Forest Hills before moving to Flushing Meadows for the 1978 tournament.

Seniors

Men's singles

🇦🇷 Guillermo Vilas defeated 🇺🇸 Jimmy Connors 2–6, 6–3, 7–6(7-4), 6–0

Women's singles

🇺🇸 Chris Evert defeated 🇦🇺 Wendy Turnbull 7–6, 6–2

Men's doubles

Bob Hewitt / Frew McMillan defeated 🇺🇸 Brian Gottfried / 🇲🇽 Raúl Ramírez 6–4, 6–0

Women's doubles

🇺🇸 Martina Navratilova / Betty Stöve defeated 🇺🇸 Renee Richards / 🇺🇸 Betty-Ann Stuart 6–1, 7–6

Mixed doubles

Betty Stöve / Frew McMillan defeated 🇺🇸 Billie Jean King / 🇺🇸 Vitas Gerulaitis 6–2, 3–6, 6–3

Juniors

Boys' singles

🇺🇸 Van Winitsky defeated 🇺🇸 Eliot Teltscher 6–4, 6–4

Girls' singles

🇦🇷 Claudia Casabianca defeated 🇺🇸 Lea Antonoplis 6–3, 2–6, 6–2