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Date: 3 August 1948 / 4 August 1948 / 5 August 1948
Heats
Semi-finals
Final
| Rank | Name | Nation | Time |
| 1 | Karen Margrethe Harup | DEN | 1:14.4 |
| 2 | Suzanne Zimmerman | USA | 1:16.0 |
| 3 | Judy-Joy Davies | AUS | 1:16.7 |
| 4 | Ilona Novak | HUN | 1:18.4 |
| 5 | Ria van der Horst | NED | 1:18.8 |
| 6 | Dicky van Ekris | NED | 1:18.9 |
| 7 | Muriel Mellon | USA | 1:19.0 |
| 8 | Greetje Gaillard | NED | 1:19.1 |
| Semi-finals | |||
| 9 | Helen Yate | GBR | 1:18.6 |
| 9 | Catherine Gibson | GBR | 1:18.6 |
| 11 | Ngaire Lane | NZL | 1:19.0 |
| 12 | Barbara Jensen | USA | 1:19.1 |
| 13 | Monique Berlioux | FRA | 1:20.2 |
| 14 | Beryl Marshall | ARG | 1:20.7 |
| 15 | Vera Ellery | GBR | 1:20.8 |
| 16 | Ingegard Fredin | SWE | |
| Heats | |||
| 17 | Magda Bruggemann | MEX | 1:21.4 |
| 18 | Bea Ballintijn | NOR | 1:22.1 |
| 19 | Edith de Oliveira | BRA | 1:22.5 |
| 20 | Ginette Jany | FRA | 1:22.7 |
| 21 | Kolbrun Olafsdottir | ISL | 1:25.6 |
| 22 | Doris Gontersweiler | SUI | 1:26.2 |
| 23 | Joyce Court | CAN | 1:26.8 |
| 24 | Liliana Gonzalias | ARG | 1:26.9 |