# 1921 World Hard Court Championships – Women's singles

The women's singles was one of five events of the 1921 World Hard Court Championships tennis tournament held in Paris, France from 28 May until 5 June 1921. The draw consisted of 22 players. Dorothy Holman was the title holder, but she lost in the second round to Jeanne Vaussard. Suzanne Lenglen defeated Molla Mallory in the final for her second World Hard Court Championship title. Lenglen had won the tournament in 1914 and would win the next two editions in 1922 and 1923 as well.

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| Molla Mallory | Molla Mallory | 8 | 6 | | | | |
| Marguerite Broquedis | Marguerite Broquedis | 6 | 4 | | | | |
| Marguerite Broquedis | Marguerite Broquedis | 6 | 4 | Molla Mallory | Molla Mallory | 2 | 3 |
| | | | | Suzanne Lenglen | Suzanne Lenglen | 6 | 6 |
| Irene Bowder Peacock | Irene Bowder Peacock | 0 | 1 | Suzanne Lenglen | Suzanne Lenglen | 6 | 6 |
| Suzanne Lenglen | Suzanne Lenglen | 6 | 6 | | | | |

### Top half

| First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| Molla Mallory | Molla Mallory | 6 | 6 | | | | | | | | | | | | | |
| Blanche Amblard | Blanche Amblard | 1 | 1 | Molla Mallory | Molla Mallory | 7 | 6 | | | | | | | | | |
| | | | | Yvonne Bourgeois | Yvonne Bourgeois | 5 | 4 | | | | | | | | | |
| | | | | | | | | Molla Mallory | Molla Mallory | 6 | 6 | | | | | |
| Jeanne Vaussard | Jeanne Vaussard | 6 | 6 | | | | | Jeanne Vaussard | Jeanne Vaussard | 2 | 2 | | | | | |
| Hélène Contostavlos | Hélène Contostavlos | 1 | 4 | Jeanne Vaussard | Jeanne Vaussard | 6 | 6 | | | | | | | | | |
| Marie Storms | Marie Storms | 3 | 4 | Dorothy Holman | Dorothy Holman | 3 | 3 | | | | | | | | | |
| Dorothy Holman | Dorothy Holman | 6 | 6 | | | | | | | | | | Molla Mallory | Molla Mallory | 8 | 6 |
| | | | | | | | | | | | | | Marguerite Broquedis | Marguerite Broquedis | 6 | 4 |
| | | | | Daisy Speranza | Daisy Speranza | 1 | 3 | | | | | | | | | |
| | | | | Germaine Golding | Germaine Golding | 6 | 6 | | | | | | | | | |
| | | | | | | | | Germaine Golding | Germaine Golding | 3 | 6 | 2 | | | | |
| | | | | | | | | Marguerite Broquedis | Marguerite Broquedis | 6 | 3 | 6 | | | | |
| | | | | Suzanne Amblard | Suzanne Amblard | 4 | 1 | | | | | | | | | |
| | | | | Marguerite Broquedis | Marguerite Broquedis | 6 | 6 | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| Irene Bowder Peacock | Irene Bowder Peacock | 4 | 6 | 6 | | | | | | | | | | | | | |
| Nanette le Besnerais | Nanette le Besnerais | 6 | 1 | 2 | Irene Bowder Peacock | Irene Bowder Peacock | 6 | 6 | | | | | | | | | |
| Eleanora Sears | Eleanora Sears | | | | Marie Conquet | Marie Conquet | 3 | 3 | | | | | | | | | |
| Marie Conquet | Marie Conquet | d | | | | | | | | Irene Bowder Peacock | Irene Bowder Peacock | 7 | 6 | | | | |
| | | | | | | | | | | Genevieve Cousin | Genevieve Cousin | 5 | 4 | | | | |
| | | | | | Genevieve Cousin | Genevieve Cousin | 3 | 6 | 6 | | | | | | | | |
| Marie Danet | Marie Danet | 4 | 3 | | Edith Sigourney | Edith Sigourney | 6 | 4 | 3 | | | | | | | | |
| Edith Sigourney | Edith Sigourney | 6 | 6 | | | | | | | | | | | Irene Bowder Peacock | Irene Bowder Peacock | 0 | 1 |
| | | | | | | | | | | | | | | Suzanne Lenglen | Suzanne Lenglen | 6 | 6 |
| | | | | | Dorothy Lammin | Dorothy Lammin | 4 | 1 | | | | | | | | | |
| | | | | | Suzanne Dévé | Suzanne Dévé | 6 | 6 | | | | | | | | | |
| | | | | | | | | | | Suzanne Dévé | Suzanne Dévé | 0 | 0 | | | | |
| | | | | | | | | | | Suzanne Lenglen | Suzanne Lenglen | 6 | 6 | | | | |
| | | | | | Anne de Borman | Anne de Borman | 0 | 0 | | | | | | | | | |
| | | | | | Suzanne Lenglen | Suzanne Lenglen | 6 | 6 | | | | | | | | | |