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Summary
Semi-final 1
| Rank | Name | Nation | Time |
| 1 | Irena Szewinska | POL | 50.48 |
| 2 | Ellen Streidt | GDR | 50.51 |
| 3 | Sheila Ingram | USA | 50.90 |
| 4 | Riitta Salin | FIN | 51.26 |
| 5 | Bethanie Nail | AUS | 51.44 |
| 6 | Lyudmila Aksenova | URS | 51.55 |
| 7 | Christiane Wildschek | AUT | 52.20 |
| Did not start | |||
| Marita Koch | GDR | ||
| Rank | Name | Nation | Time |
| 1 | Rosalyn Bryant | USA | 50.62 |
| 2 | Christina Brehmer | GDR | 50.86 |
| 3 | Pirjo Haggman | FIN | 51.03 |
| 4 | Debra Sapenter | USA | 51.34 |
| 5 | Nadezhda Ilyina | URS | 51.42 |
| 6 | Verna Burnard | AUS | 51.71 |
| 7 | Rita Wilden | FRG | 51.82 |
| 8 | Natalia Sokolova | URS | 51.95 |