The 1991 US Open was a tennis tournament played on outdoor hard courts at the USTA National Tennis Center in New York City in New York in the United States. It was the 111th edition of the US Open and was held from August 26 to September 8, 1991.
23x15px Stefan Edberg defeated 23x15px Jim Courier 6–2, 6–4, 6–0
- It was Edberg's 5th career Grand Slam title and his 1st US Open title.
23x15px Monica Seles defeated 23x15px Martina Navratilova 7–6(7–1), 6–1
- It was Seles' 4th career Grand Slam title and her 1st US Open title.
23x15px John Fitzgerald / 23x15px Anders Järryd defeated 23x15px Scott Davis / 23x15px David Pate 6–3, 3–6, 6–3, 6–3
- It was Fitzgerald's 9th and last career Grand Slam title and his 3rd US Open title. It was Järryd's 8th and last career Grand Slam title and his 2nd US Open title.
23x15px Pam Shriver / 23x15px Natasha Zvereva defeated 23x15px Jana Novotná / 23x15px Larisa Savchenko 6–4, 4–6, 7–6(7–5)
- It was Shriver's 22nd and last career Grand Slam title and her 5th US Open title. It was Zvereva's 4th career Grand Slam title and her 1st US Open title.
23x15px Manon Bollegraf / 23x15px Tom Nijssen defeated 23x15px Arantxa Sánchez Vicario / 23x15px Emilio Sánchez 6–2, 7–6(7–2)
- It was Bollegraf's 2nd career Grand Slam title and her 1st US Open title. It was Nijssen's 2nd and last career Grand Slam title and his only US Open title.
Template:Country data IND Leander Paes defeated 23x15px Karim Alami 6–4, 6–4
23x15px Karina Habšudová defeated 23x15px Anne Mall 6–1, 6–3
23x15px Karim Alami / 23x15px John-Laffnie de Jager defeated 23x15px Michael Joyce / 23x15px Vince Spadea 6–4, 6–7, 6–1
23x15px Kristin Godridge / 23x15px Nicole Pratt defeated 23x15px Åsa Carlsson / 23x15px Cătălina Cristea 7–6, 7–5