| Final | time | gap | L | Q | Y | | 1. Maria Philipsen-Braun |  Netherlands | 1:22.0 | | | 1. | 17 | | 2. Ellen King |  Great Britain | 1:22.2 | +0.2s | | 2. | 19 | | 3. Joyce Cooper | Great Britain | 1:22.8 | +0.8s | | 6. | 19 | | 4. Marion Gilman |  United States | 1:24.2 | +2.2s | | 5. | 14 | | 5. Eleanor Holm | United States | 1:24.4 | +2.4s | | 4. | 14 | | 5. Lisa Lindstrom | United States | 1:24.4 | +2.4s | | 3. | 16 | | 7. Elizabeth Stockley |  New Zealand | 1:25.8 | +3.8s | | 7. | 22 |
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100m backstroke was a splendid race in which a yard would have covered the first 6 competitors at the finish. The world's holder Miss Braun, was slightly ahead at halfway with the others all level.
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Heats - Friday, 10th August | | First 2 from each Heat and Best 3rd place. |
| Heat 1 15:40 | Team | time | Rk. | L | Y | | 1. Ellen King | Great Britain | 1:22.0 | 2. | 2 | 19 | | 2. Marion Gilman | United States | 1:24.0 | 5. | 1 | 14 | | 3. Elizabeth Stockley | New Zealand | 1:25.4 | 7. | 5 | 22 | | -. Willhemina den Turk | Netherlands | DNS | | 3 | 20 | | -. Kohn |  Austria | DNS | | 6 | | | -. Agnete Olsen |  Denmark | DNS | | 4 | 18 |
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| Heat 2 15:47 | Team | time | Rk. | L | Y | | 1. Maria Philipsen-Braun | Netherlands | 1:21.6 WR | 1. | 1 | 17 | | 2. Lisa Lindstrom | United States | 1:23.0 | 3. | 3 | 16 | | 3. Phyllis Harding | Great Britain | 1:27.8 | 9. | 2 | 20 | | 4. Philomena Mealing |  Australia | 1:28.4 | 10. | 5 | 15 | | -. Anni Rehborn |  Germany | DNS | | 4 | 23 |
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| Heat 3 15:55 | Team | time | Rk. | L | Y | | 1. Eleanor Holm | United States | 1:23.6 | 4. | 5 | 14 | | 2. Joyce Cooper | Great Britain | 1:24.2 | 6. | 2 | 19 | | 3. Jeanne Grendel | Netherlands | 1:26.2 | 8. | 4 | 15 | | 4. Else Jacobsen | Denmark | 1:31.5 | 11. | 1 | 17 | | 5. Marie-Jeanne Bernard |  Luxembourg | 1:34.0 | 12. | 2 | 19 |
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