The 1990 US Open was a tennis tournament played on outdoor hard courts at the USTA National Tennis Center in New York City in the United States.

It was the 110th edition of the US Open and was held from August 27 to September 9, 1990.

Pete Sampras defeated Andre Agassi 6–4, 6–3, 6–2 Gabriela Sabatini defeated Steffi Graf 6–2, 7–6(7–4) Pieter Aldrich / Danie Visser defeated Paul Annacone / David Wheaton 6–2, 7–6 (7–3), 6–2 Gigi Fernández / Martina Navratilova defeated Jana Novotná / Helena Suková 6–2, 6–4 Elizabeth Smylie / Todd Woodbridge defeated Natasha Zvereva / Jim Pugh 6–4, 6–2 Andrea Gaudenzi defeated Mikael Tillström 6–2, 4–6, 7–6 Magdalena Maleeva defeated Noëlle van Lottum 7–5, 6–2 Sébastien Leblanc / Greg Rusedski defeated Marten Renström / Mikael Tillström 6–7, 6–3, 6–4 Kristin Godridge / Kirrily Sharpe defeated Erika deLone / Lisa Raymond 4–6, 7–5, 6–2 Sandy Mayer defeated Tom Gullikson 6–4, 6–4 Tom Gullikson / Dick Stockton defeated Mark Edmondson / Sherwood Stewart 6–7, 7–6, 6–4 Rosemary Casals / Billie Jean King defeated Wendy Turnbull / Virginia Wade 2–6, 6–4, 6–3 Total prize money for the event was $6,349,250.