| 1999 US Open | |
|---|---|
| Date | August 30 – September 12 |
| Edition | 119th |
| Category | Grand Slam (ITF) |
| Surface | Hardcourt |
| Location | New York City, New York, United States |
| Champions | |
| Men's singles | |
 Andre Agassi | |
| Women's singles | |
| Serena Williams | |
| Men's doubles | |
 Sébastien Lareau / Alex O'Brien | |
| Women's doubles | |
| Serena Williams / Venus Williams | |
| Mixed doubles | |
 Ai Sugiyama /  Mahesh Bhupathi | |
| Boys' singles | |
 Jarkko Nieminen | |
| Girls' singles | |
 Lina Krasnoroutskaya | |
| Boys' doubles | |
 Julien Benneteau / Nicolas Mahut | |
| Girls' doubles | |
 Dája Bedáňová /  Iroda Tulyaganova | |
The 1999 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 119th edition of the US Open and was held from August 30 through September 12, 1999.