| Final: Start time: 20:40 +8 UTC, Temperature 26° C, Humidity 61 % _ |
| Ranking Final | time | | L | React. | bib | | 1. Allyson Felix |  USA | 49.26s | Wl | 6 | 0.164 | 879 | | 2. Shaunae Miller |  BAH | 49.67s | Pb | 5 | 0.176 | 142 | | 3. Shericka Jackson |  JAM | 49.99s | Pb | 4 | 0.196 | 512 | | 4. Christine Day | JAM | 50.14s | Pb | 8 | 0.180 | 509 | | 5. Stephenie Ann McPherson | JAM | 50.42s | | 9 | 0.150 | 515 | | 6. Novlene Williams-Mills | JAM | 50.47s | Sb | 2 | 0.313 | 513 | | 7. Phyllis Francis | USA | 50.51s | | 3 | 0.183 | 881 | | 8. Christine Ohuruogu |  GBR | 50.63s | | 7 | 0.189 | 390 |
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| Women 400m History | | Qualifiyng standard: 52.00s | | Event Target Number: 48 Athletes. |
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| | | First 2 and Best 2 advanced to Semi-Finals. |
Semi 1: Start time: 19:04, Temperature 26° C, Humidity 65 %%
| Ranking Semi 1 | time | | L | React. | bib | | 1. Shaunae Miller | BAH | 50.12s | | 6 | 0.167 | 142 | | 2. Christine Day | JAM | 50.82s | | 5 | 0.216 | 509 | | 3. Libania Grenot |  ITA | 51.14s | | 3 | 0.175 | 489 | | 4. Floria Guei |  FRA | 51.30s | | 4 | 0.188 | 366 | | 5. Natasha Hastings | USA | 51.33s | | 9 | 0.154 | 889 | | 6. Nadezhda Kotlyarova |  RUS | 51.86s | | 8 | 0.184 | 725 | | 7. Anneliese Rubie |  AUS | 52.04s | | 2 | 0.180 | 112 | | -. Joyce Zakary |  KEN | DNS | | 7 | | 578 |
Semi 2: Start time: 19:11, Temperature 26° C, Humidity 65 %%
| Ranking Semi 2 | time | | L | React. | bib | | 1. Christine Ohuruogu | GBR | 50.16s | Sb | 7 | 0.170 | 390 | | 2. Stephenie Ann McPherson | JAM | 50.32s | Sb | 6 | 0.135 | 515 | | 3. Phyllis Francis | USA | 50.50s | Sb | 4 | 0.189 | 881 | | 4. Patience Okon George |  NGR | 50.76s | Pb | 8 | 0.252 | 630 | | 5. Marie Gayot | FRA | 50.97s | Pb | 5 | 0.213 | 367 | | 6. Ekaterina Renzhina | RUS | 51.49s | Pb | 9 | 0.158 | 736 | | 7. Patrycja Wyciszkiewicz |  POL | 51.94s | | 2 | 0.153 | 678 | | 8. Carline Muir |  CAN | 52.31s | | 3 | 0.228 | 205 |
Semi 3: Start time: 19:19, Temperature 25° C, Humidity 69 %%
| Ranking Semi 3 | time | | L | React. | bib | | 1. Allyson Felix | USA | 49.89s | Sb | 7 | 0.154 | 879 | | 2. Shericka Jackson | JAM | 50.03s | Pb | 5 | 0.187 | 512 | | 3. Novlene Williams-Mills | JAM | 50.47s | Sb | 6 | 0.204 | 513 | | 4. Nataliia Pygyda |  UKR | 50.62s | Pb | 9 | 0.176 | 843 | | 5. Anyika Onuora | GBR | 50.87s | Pb | 2 | 0.175 | 389 | | 6. Bianca Razor |  ROU | 51.05s | | 4 | 0.167 | 698 | | 7. Maureen Jelagat Maiyo | KEN | 51.92s | | 3 | 0.182 | 571 | | 8. Kabange Mupopo |  ZAM | 51.93s | | 8 | 0.178 | 944 |
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| Heat 1: Start time: 10:43, Temperature 27° C, Humidity 58 |
| Ranking Heat 1 | time | | L | React. | bib | | 1. Allyson Felix | USA | 50.60s | | 6 | 0.173 | 879 | | 2. Floria Guei | FRA | 50.89s | Pb | 7 | 0.203 | 366 | | 3. Nataliia Pygyda | UKR | 51.07s | Sb | 3 | 0.184 | 843 | | 4. Patrycja Wyciszkiewicz | POL | 51.31s | Pb | 9 | 0.190 | 678 | | 5. Anneliese Rubie | AUS | 51.69s | Pb | 4 | 0.184 | 112 | | 6. Kineke Alexander |  VIN | 52.24s | | 8 | 0.217 | 943 | | 7. Iveta Putalová |  SVK | 52.52s | | 5 | 0.219 | 782 |
| Heat 2: Start time: 10:51, Temperature 28° C, Humidity 55 |
| Ranking Heat 2 | time | | L | React. | bib | | 1. Christine Ohuruogu | GBR | 51.01s | | 3 | 0.177 | 390 | | 2. Marie Gayot | FRA | 51.24s | Pb | 6 | 0.200 | 367 | | 3. Natasha Hastings | USA | 51.25s | | 7 | 0.154 | 889 | | 4. Maureen Jelagat Maiyo | KEN | 51.40s | Pb | 8 | 0.199 | 571 | | 5. Tosin Adeloye | NGR | 52.42s | | 9 | 0.234 | 628 | | 6. Geisa Aparecida Coutinho |  BRA | 52.72s | | 5 | 0.187 | 173 | | 7. Amaliya Sharoyan |  ARM | 54.16s | | 4 | 0.183 | 109 |
| Heat 3: Start time: 10:58, Temperature 28° C, Humidity 55 |
| Ranking Heat 3 | time | | L | React. | bib | | 1. Christine Day | JAM | 50.58s | | 4 | 0.215 | 509 | | 2. Joyce Zakary | KEN | 50.71s | Nr | 3 | 0.189 | 578 | | 3. Kabange Mupopo | ZAM | 51.55s | | 8 | 0.180 | 944 | | 4. Mariya Mikhailyuk | RUS | 52.16s | | 5 | 0.229 | 730 | | 5. Gunta Latiševa-Cudare |  LAT | 52.17s | Pb | 7 | 0.229 | 585 | | 6. Mariabenedicta Chigbolu | ITA | 52.48s | | 6 | 0.190 | 488 | | 7. Audrey Jean-Baptiste | CAN | 53.18s | | 9 | 0.154 | 209 |
| Heat 4: Start time: 11:05, Temperature 28° C, Humidity 55 |
| Ranking Heat 4 | time | | L | React. | bib | | 1. Stephenie Ann McPherson | JAM | 50.34s | Sb | 5 | 0.169 | 515 | | 2. Phyllis Francis | USA | 50.52s | Sb | 6 | 0.170 | 881 | | 3. Nadezhda Kotlyarova | RUS | 51.42s | Pb | 3 | 0.187 | 725 | | 4. Regina George | NGR | 51.74s | | 9 | 0.192 | 631 | | 5. Malgorzata Holub | POL | 51.74s | Pb | 4 | 0.200 | 668 | | 6. Justine Palframan |  RSA | 52.45s | | 8 | 0.168 | 708 | | 7. Dil Maya Karki |  NEP | 1:00.99 | Sb | 7 | 0.191 | 627 |
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| Heat 5: Start time: 11:12, Temperature 28° C, Humidity 55 |
| Ranking Heat 5 | time | | L | React. | bib | | 1. Bianca Razor | ROU | 50.37s | Pb | 8 | 0.194 | 698 | | 2. Shericka Jackson | JAM | 50.41s | | 5 | 0.183 | 512 | | 3. Patience Okon George | NGR | 50.87s | | 3 | 0.249 | 630 | | 4. Anyika Onuora | GBR | 51.14s | Pb | 6 | 0.167 | 389 | | 5. Carline Muir | CAN | 51.70s | Sb | 4 | 0.229 | 205 | | 6. Lisneidy Veitia |  CUB | 52.25s | | 7 | 0.364 | 291 | | -. Jacinter Shikanda | KEN | DQ R163.3(a) | 9 | 0.206 | 574 |
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| Rule 163.3(a) - Lane Infringement. |
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| Heat 6: Start time: 11:19, Temperature 28° C, Humidity 55 |
| Ranking Heat 6 | time | | L | React. | bib | | 1. Shaunae Miller | BAH | 50.53s | | 5 | 0.181 | 142 | | 2. Novlene Williams-Mills | JAM | 51.07s | Sb | 3 | 0.306 | 513 | | 3. Ekaterina Renzhina | RUS | 51.55s | | 7 | 0.193 | 736 | | 4. Libania Grenot | ITA | 51.64s | | 8 | 0.186 | 489 | | 5. Olha Zemlyak | UKR | 52.00s | | 9 | 0.197 | 853 | | 6. Iga Baumgart | POL | 52.02s | Pb | 6 | 0.228 | 663 | | 7. Aauri Lorena Bokesa |  ESP | 52.98s | | 4 | 0.194 | 322 |
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| Record | Athlete | mark | venue | date | | World Record | Marita Koch (GDR) | 47.60s | Canberra, Australia | 6 October 1985 | | Championship Record | Jarmila Kratochvílová (TCH) | 47.99s | Helsinki, Finland | 10 August 1983 | | World Leading | Francena McCorory (USA) | 49.83s | Fontvieille, Monaco | 17 July 2015 | | African Record | Falilat Ogunkoya (NGR) | 49.10s | Atlanta, United States | 29 July 1996 | | Asian Record | Ma Yuqin (CHN) | 49.81s | Beijing, China | 11 September 1993 | | Nacac Record | Sanya Richards-Ross (USA) | 48.70s | Athens, Greece | 16 September 2006 | | South American Record | Ximena Restrepo (COL) | 49.64s | Barcelona, Spain | 5 August 1992 | | European Record | Marita Koch (GDR) | 47.60s | Canberra, Australia | 6 October 1985 | | Oceanian Record | Cathy Freeman (AUS) | 48.63s | Atlanta, United States | 29 July 1996 |
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| Athlete | Best 2015 | Pers. Best | Heat | L | birth | bib |
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