The 1981 US Open was a tennis tournament played on outdoor hard courts at the USTA National Tennis Center in New York City, New York. It was the 101st edition of the US Open and was held from September 1 to September 13, 1981. It marked the centenary of the inaugural tournament.
| 1981 US Open | |
|---|---|
| Date | September 1–13 |
| Edition | 101st |
| Category | Grand Slam (ITF) |
| Surface | Hardcourt |
| Location | New York City, New York |
| Champions | |
| Men's singles | |
 John McEnroe | |
| Women's singles | |
| Tracy Austin | |
| Men's doubles | |
| Peter Fleming / John McEnroe | |
| Women's doubles | |
| Kathy Jordan / Anne Smith | |
| Mixed doubles | |
Anne Smith /  Kevin Curren | |
| Boys' singles | |
 Thomas Högstedt | |
| Girls' singles | |
| Zina Garrison | |
Seniors
editMen's singles
edit John McEnroe defeated Björn Borg 4–6, 6–2, 6–4, 6–3
- It was McEnroe's 4th career Grand Slam title and his 3rd US Open title.
Women's singles
edit Tracy Austin defeated Martina Navratilova 1–6, 7–6(7–4), 7–6(7–1)
- It was Austin's 2nd and last career Grand Slam title and her 2nd US Open title.
Men's doubles
edit Peter Fleming / John McEnroe defeated 
Heinz Günthardt / 
Peter McNamara by walkover
- It was Fleming's 4th career Grand Slam title and his 2nd US Open title. It was McEnroe's 9th career Grand Slam title and his 4th US Open title.
Women's doubles
edit Kathy Jordan / Anne Smith defeated Rosemary Casals / Wendy Turnbull 6–3, 6–3
- It was Jordan's 3rd career Grand Slam title and her only US Open title. It was Smith's 4th career Grand Slam title and her 1st US Open title.
Mixed doubles
edit Anne Smith / Kevin Curren defeated JoAnne Russell / Steve Denton 6–4, 7–6(7–4)
- It was Smith's 5th career Grand Slam title and her 2nd US Open title. It was Curren's 1st career Grand Slam title and his 1st US Open title.
Juniors
editBoys' singles
edit Thomas Högstedt defeated 
Hans Schwaier 7–5, 6–3
Girls' singles
edit Zina Garrison defeated Kate Gompert 6–0, 6–3