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Date: 4 August 1984 / 5 August 1984 / 6 August 1984
Heats
Semi-finals
Final
| Rank | Name | Nation | Time |
| 1 | Valerie Brisco-Hooks | USA | 48.83 |
| 2 | Chandra Cheeseborough | USA | 49.05 |
| 3 | Kathy Cook | GBR | 49.42 |
| 4 | Marita Payne | CAN | 49.91 |
| 5 | Lillie Leatherwood | USA | 50.25 |
| 6 | Ute Thimm | FRG | 50.37 |
| 7 | Charmaine Crooks | CAN | 50.45 |
| 8 | Ruth Waithera | KEN | 51.56 |
| Semi-finals | |||
| 9 | Molly Killingbeck | CAN | 51.72 |
| 10 | Michelle Scutt | GBR | 52.07 |
| 11 | Ilrey Oliver | JAM | 52.14 |
| 12 | Helen Barnett | GBR | 52.26 |
| 13 | June Griffith | GUY | 52.39 |
| 14 | Cathy Rattray | JAM | 53.23 |
| 15 | Marie Lande Mathieu | PUR | 53.69 |
| 16 | Gaby Bussmann | FRG | |
| Heats | |||
| 17 | Heike Schulte-Mattler | FRG | 52.77 |
| 18 | Erica Rossi | ITA | 53.04 |
| 19 | Cynthia Green | JAM | 53.61 |
| 20 | Joycelyn Joseph | ANT | 53.63 |
| 21 | Gail Emmanuel | TTO | 54.07 |
| 22 | Carlon Blackman | BAR | 54.26 |
| 23 | Zonia Meigham-Juarez | GUA | 55.64 |
| 24 | Emma Tahapari | INA | 55.82 |
| 25 | Elanga Buala | PNG | 56.82 |
| 26 | Realwadee Srithoa | THA | 58.11 |
| 27 | Mercy Addy | GHA | 58.91 |
| 28 | Zeina Mina | LBN | 59.56 |