# Swimming at the 1948 Summer Olympics – Women's 100 metre freestyle

The women's 100 metre freestyle event at the 1948 Olympic Games took place between 30 July and 2 August at the Empire Pool. This swimming event used freestyle swimming, which means that the method of the stroke is not regulated (unlike backstroke, breaststroke, and butterfly events). Nearly all swimmers use the front crawl or a variant of that stroke. Because an Olympic size swimming pool is 50 metres long, this race consisted of two lengths of the pool.

## Results
### Heats

| Rank | Athlete | Country | Time |
| 1 | Fritze Carstensen | Denmark | 1:06.5 |
| 2 | Ann Curtis | United States | 1:06.9 |
| 3 | Greta Andersen | Denmark | 1:07.0 |
| 4 | Marie-Louise Linssen-Vaessen | Netherlands | 1:07.5 |
| 5 | Irma Heijting-Schuhmacher | Netherlands | 1:07.9 |
| 6 | Ingegerd Fredin | Sweden | 1:08.1 |
| 7 | Judit Temes | Hungary | 1:08.3 |
| 8 | Karen Margrethe Harup | Denmark | 1:08.4 |
| 9 | Marie Corridon | United States | 1:08.4 |
| 10 | Marjorie McQuade | Australia | 1:08.5 |
| 11 | Piedade Coutinho-Tavares | Brazil | 1:08.6 |
| 12 | Elisabeth Ahlgren | Sweden | 1:08.7 |
| 13 | Brenda Helser | United States | 1:09.0 |
| 14 | Marianne Lundquist | Sweden | 1:09.0 |
| 15 | Lillian Preece | Great Britain | 1:09.0 |
| 16 | Patricia Nielsen | Great Britain | 1:09.4 |
| 17 | Josette Arène | France | 1:09.7 |
| 18 | Margaret Wellington | Great Britain | 1:09.8 |
| 19 | Hannie Termeulen | Netherlands | 1:09.8 |
| 20 | Denise Spencer | Australia | 1:10.0 |
| 21 | Eleonora Schmitt | Brazil | 1:10.8 |
| 22 | Eileen Holt | Argentina | 1:12.0 |
| 23 | Ginette Jany-Sendral | France | 1:12.1 |
| 24 | Fernande Caroen | Belgium | 1:12.1 |
| 25 | Magda Bruggemann | Mexico | 1:12.5 |
| 26 | Mária Littomeritzky | Hungary | 1:13.0 |
| 27 | Kay McNamee | Canada | 1:13.3 |
| 28 | Irene Strong | Canada | 1:13.5 |
| 29 | Gisèle Vallerey | France | 1:14.0 |
| 30 | Enriqueta Duarte | Argentina | 1:14.9 |
| 31 | Zsuzsa Nádor | Hungary | 1:15.8 |
| 32 | Maria da Costa | Brazil | 1:16.0 |
| 33 | Adriana Camelli | Argentina | 1:16.5 |
| 34 | Marianne Erismann | Switzerland | 1:19.9 |

### Semifinals

| Rank | Athlete | Country | Time | Notes |
| 1 | Greta Andersen | Denmark | 1:05.9 | Q |
| 2 | Fritze Carstensen | Denmark | 1:07.5 | Q |
| 3 | Ann Curtis | United States | 1:07.6 | Q |
| 4 | Irma Heijting-Schuhmacher | Netherlands | 1:07.7 | Q |
| 5 | Marie-Louise Linssen-Vaessen | Netherlands | 1:08.4 | Q |
| 6 | Ingegerd Fredin | Sweden | 1:08.4 | Q |
| 7 | Elisabeth Ahlgren | Sweden | 1:08.6 | q |
| 8 | Karen Margrethe Harup | Denmark | 1:08.7 | q |
| 9 | Marie Corridon | United States | 1:08.9 | |
| 10 | Marianne Lundquist | Sweden | 1:09.3 | |
| 11 | Lillian Preece | Great Britain | 1:09.3 | |
| 12 | Marjorie McQuade | Australia | 1:09.5 | |
| 13 | Piedade Coutinho-Tavares | Brazil | 1:09.5 | |
| 14 | Patricia Nielsen | Great Britain | 1:09.6 | |
| 15 | Judit Temes | Hungary | 1:09.7 | |
| 16 | Brenda Helser | United States | 1:10.0 | |

### Final

| Rank | Athlete | Country | Time |
| | Greta Andersen | Denmark | 1:06.3 |
| | Ann Curtis | United States | 1:06.5 |
| | Marie-Louise Linssen-Vaessen | Netherlands | 1:07.6 |
| 4 | Karen Margrethe Harup | Denmark | 1:08.1 |
| 5 | Ingegerd Fredin | Sweden | 1:08.4 |
| 6 | Irma Heijting-Schuhmacher | Netherlands | 1:08.4 |
| 7 | Elisabeth Ahlgren | Sweden | 1:08.8 |
| 8 | Fritze Carstensen | Denmark | 1:09.1 |