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Date: 5 August 1984 / 6 August 1984 / 8 August 1984
Heats
Semi-finals
Final
| Rank | Name | Nation | Time |
| 1 | Nawal El Moutawakel | MAR | 54.61 |
| 2 | Judi Brown | USA | 55.20 |
| 3 | Cristieana Cojocaru | ROU | 55.41 |
| 4 | P.T. Usha | IND | 55.42 |
| 5 | Ann-Louise Skoglund | SWE | 55.43 |
| 6 | Debbie Flintoff | AUS | 56.21 |
| 7 | Tuija Helander | FIN | 56.55 |
| 8 | Sandra Farmer | JAM | 57.15 |
| Semi-finals | |||
| 9 | Sharrieffa Barksdale | USA | 56.19 |
| 10 | Giuseppina Cirulli | ITA | 56.45 |
| 11 | Maria Usifo | NGR | 56.55 |
| 12 | Susan Morley | GBR | 56.67 |
| 13 | Gladys Taylor | GBR | 56.72 |
| 14 | Olga Commandeur | NED | 57.01 |
| 15 | Ruth Kyalisima | UGA | 57.02 |
| 16 | Andrea Page | CAN | 57.89 |
| Heats | |||
| 17 | Lynnette Grime | NZL | 58.02 |
| 18 | Dana Wright | CAN | 58.17 |
| 19 | Overill Dwyer-Brown | JAM | 58.42 |
| 20 | Lai Lih-Jiau | TPE | 58.54 |
| 21 | Angela Wright-Scott | USA | 59.77 |
| 22 | M.D. Valsamma | IND | 1:00.03 |
| 23 | Alma Vazquez | MEX | 1:00.86 |
| 24 | Cheryl Blackman | BAR | 1:01.19 |
| 25 | Mary Parr | IRL | 1:01.66 |
| 26 | Agripina De La Cruz | PHI | 1:02.70 |