| 1985 US Open | |
|---|---|
| Date | August 27 – September 8 |
| Edition | 105th |
| Category | Grand Slam (ITF) |
| Surface | Hardcourt |
| Location | New York City, New York, United States |
| Champions | |
| Men's singles | |
 Ivan Lendl | |
| Women's singles | |
| Hana Mandlíková | |
| Men's doubles | |
 Ken Flach / Robert Seguso | |
| Women's doubles | |
 Claudia Kohde-Kilsch / Helena Suková | |
| Mixed doubles | |
Martina Navratilova /  Heinz Günthardt | |
| Boys' singles | |
| Tim Trigueiro | |
| Girls' singles | |
 Laura Garrone | |
| Boys' doubles | |
| Joey Blake / Darren Yates | |
| Girls' doubles | |
| Andrea Holíková / Radka Zrubáková | |
The 1985 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 105th edition of the US Open and was held from August 27 to September 8, 1985.