| POS | Rank | Heat | BIB | ATHLETE | COUNTRY | RESULTS | ms* | 
|---|---|---|---|---|---|---|---|
| 1 | 1 | 3 | 1420 | Shamier LITTLE |  USA | 52.81 Q SB | |
| 2 | 1 | 2 | 1136 | Femke BOL |  NED | 52.95 Q | |
| 3 | 1 | 1 | 1008 | Rushell CLAYTON |  JAM | 53.30 Q PB | |
| 4 | 2 | 3 | 599 | Kemi ADEKOYA |  BRN | 53.39 Q AR | |
| 5 | 2 | 1 | 1383 | Anna COCKRELL |  USA | 53.63 Q PB | |
| 6 | 3 | 3 | 1026 | Janieve RUSSELL |  JAM | 53.69 q | |
| 7 | 2 | 2 | 1018 | Andrenette KNIGHT |  JAM | 53.72 Q | |
| 8 | 4 | 3 | 987 | Ayomide FOLORUNSO |  ITA | 53.89 q NR | |
| 9 | 3 | 2 | 1431 | Dalilah MUHAMMAD |  USA | 54.19 | |
| 10 | 4 | 2 | 1366 | Anna RYZHYKOVA |  UKR | 54.42 SB | |
| 11 | 3 | 1 | 790 | Viivi LEHIKOINEN |  FIN | 54.48 | |
| 12 | 4 | 1 | 850 | Jessie KNIGHT |  GBR | 54.51 | |
| 13 | 5 | 2 | 887 | Carolina KRAFZIK |  GER | 54.58 | |
| 14 | 5 | 3 | 1145 | Cathelijn PEETERS |  NED | 54.63 | |
| 15 | 5 | 1 | 1196 | Gianna WOODRUFF |  PAN | 54.71 | |
| 16 | 6 | 3 | 629 | Savannah SUTHERLAND |  CAN | 54.99 | |
| 17 | 6 | 2 | 690 | Nikoleta JÍCHOVÁ |  CZE | 55.01 | |
| 18 | 6 | 1 | 1119 | Noura ENNADI |  MAR | 55.15 | |
| 19 | 7 | 1 | 1369 | Viktoriya TKACHUK |  UKR | 55.43 | .427 | 
| 20 | 7 | 2 | 1182 | Line KLOSTER |  NOR | 55.43 | .429 | 
| 21 | 8 | 2 | 1266 | Zenéy GELDENHUYS |  RSA | 55.49 | |
| 22 | 8 | 1 | 1000 | Rebecca SARTORI |  ITA | 55.98 | |
| 23 | 7 | 3 | 553 | Hanne CLAES |  BEL | 56.06 | |
| 24 | 8 | 3 | 874 | Eileen DEMES |  GER | 56.71 | 
ms - Milliseconds - shown when two or more competitors finish with the same time down to hundredths of a second