Women's 400m Semi-Final 1
mercredi 4 août 2021, 10h30 GMT – 15h30 GMT
| Nom | Temps | |
|---|---|---|
| 1 |  Marileidy Paulino | 49.38″ |
| 2 |  Candice McLeod | + 0.13″ |
| 3 |  Roxana Gomez | + 0.33″ |
| 4 |  Quanera Hayes | + 0.43″ |
| 5 |  Eleni Artymata | + 1.42″ |
| 6 | Susanne Walli | + 2.14″ |
| 7 |  Ama Pipi | + 2.21″ |
| 8 |  Lada Vondrova | + 2.24″ |