| Before Year: | 2019 |
| Qual Type: | qual mens womens singles |
See main article: article, 2021 US Open (tennis) and 2021 US Open – Women's singles.
The 2021 US Open – Women's Singles Qualifying was a series of tennis matches from 24 August 2021 to 27 August 2021 where 128 players competed to determine the 16 qualifiers into the main draw of the 2021 US Open women's singles tournament, and, if necessary, the lucky losers. Due to pandemic-related restrictions, the qualifying matches were not open to the public.[1]
For the first time in Major singles history, a qualifier, Emma Raducanu, went on to win the main tournament.