1977 US Open – Mixed doubles

Phil Dent and Billie Jean King were the defending champions but only Billie Jean King competed that year with Vitas Gerulaitis. Vitas Gerulaitis and Billie Jean King lost in the final 6–2, 3–6, 6–3 against Frew McMillan and Betty Stöve.

Seeds
• # 🇦🇺 Bob Hewitt / Greer Stevens (semifinals)

• # Frew McMillan /  Betty Stöve (champions)

• # 🇺🇸 Vitas Gerulaitis / 🇺🇸 Billie Jean King (final)

• # 🇺🇸 Marty Riessen / 🇫🇷 Françoise Dürr (first round)