# Swimming at the 1984 Summer Olympics – Women's 100 metre breaststroke

The final of the women's 100 metre backstroke event at the 1984 Summer Olympics was held in the McDonald's Olympic Swim Stadium in Los Angeles, California, on August 2, 1984.

## Records

Prior to this competition, the existing world and Olympic records were as follows.
| World record | Ute Geweniger (GDR) | 1:08.51 | Rome, Italy | 25 August 1983 |
| Olympic record | Ute Geweniger (GDR) | 1:10.11 | Moscow, Soviet Union | 24 July 1980 |
The following records were established during the competition:
| Date | Round | Name | Nation | Time | Record |
| 2 August | Final A | Petra van Staveren | Netherlands | 1:09.88 | OR |

## Results
### Heats

Rule: The eight fastest swimmers advance to final A (Q), while the next eight to final B (q).
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 2 | 5 | Catherine Poirot | France | 1:10.69 | Q, NR |
| 2 | 3 | 4 | Petra van Staveren | Netherlands | 1:11.18 | Q |
| 3 | 2 | 2 | Jean Hill | Great Britain | 1:11.37 | Q |
| 4 | 4 | 3 | Eva-Marie Håkansson | Sweden | 1:11.41 | Q |
| 5 | 4 | 5 | Susan Rapp | United States | 1:11.63 | Q |
| 6 | 2 | 4 | Anne Ottenbrite | Canada | 1:11.81 | Q |
| 7 | 4 | 4 | Hiroko Nagasaki | Japan | 1:11.82 | Q |
| 8 | 1 | 4 | Tracy Caulkins | United States | 1:11.99 | Q |
| 9 | 3 | 2 | Ingrid Lempereur | Belgium | 1:12.08 | q |
| 10 | 1 | 3 | Ute Hasse | West Germany | 1:12.17 | q |
| 10 | 2 | 6 | Dimity Douglas | Australia | 1:12.17 | q |
| 12 | 1 | 5 | Lisa Borsholt | Canada | 1:12.24 | q |
| 13 | 3 | 3 | Angelika Knipping | West Germany | 1:12.41 | q |
| 14 | 2 | 7 | Patricia Brülhart | Switzerland | 1:12.44 | q |
| 15 | 4 | 6 | Annelie Holmström | Sweden | 1:12.60 | q |
| 16 | 2 | 3 | Carlotta Tagnin | Italy | 1:12.70 | q |
| 17 | 1 | 6 | Sandra Bowman | Great Britain | 1:12.92 | |
| 18 | 3 | 7 | Sharon Kellett | Australia | 1:13.43 | |
| 19 | 1 | 2 | Petra Hillenius | Netherlands | 1:14.09 | |
| 20 | 4 | 2 | Liang Weifen | China | 1:14.38 | |
| 21 | 3 | 6 | Alicia María Boscatto | Argentina | 1:14.45 | |
| 22 | 4 | 7 | Kaori Iwasaki | Japan | 1:14.68 | |
| 23 | 4 | 1 | Sara Guido | Mexico | 1:14.69 | |
| 24 | 1 | 7 | Maarit Vähäsaari-Sihvonen | Finland | 1:14.85 | |
| 25 | 3 | 1 | Guðrún Ágústsdóttir | Iceland | 1:16.70 | |
| 26 | 2 | 1 | Rosa María Silva | Uruguay | 1:17.11 | |
| 27 | 1 | 1 | Chow Lai Yee | Hong Kong | 1:17.92 | |
| 28 | 4 | 8 | Helen Chow | Malaysia | 1:18.99 | |
| 29 | 3 | 8 | Isabel Lardizábal | Honduras | 1:25.12 | |
| | 3 | 5 | Manuela Dalla Valle | Italy | DSQ | |

### Finals
#### Final B

| Rank | Lane | Name | Nationality | Time | Notes |
| 9 | 3 | Ute Hasse | West Germany | 1:11.44 | NR |
| 10 | 4 | Ingrid Lempereur | Belgium | 1:11.45 | NR |
| 11 | 5 | Dimity Douglas | Australia | 1:12.00 | OC |
| 12 | 2 | Angelika Knipping | West Germany | 1:12.03 | |
| 13 | 6 | Lisa Borsholt | Canada | 1:12.41 | |
| 14 | 8 | Carlotta Tagnin | Italy | 1:12.77 | |
| 15 | 7 | Patricia Brülhart | Switzerland | 1:12.89 | |
| 16 | 1 | Annelie Holmström | Sweden | 1:13.27 | |

#### Final A

| Rank | Lane | Name | Nationality | Time | Notes |
| | 5 | Petra van Staveren | Netherlands | 1:09.88 | OR |
| | 7 | Anne Ottenbrite | Canada | 1:10.69 | |
| | 4 | Catherine Poirot | France | 1:10.70 | |
| 4 | 8 | Tracy Caulkins | United States | 1:10.88 | |
| 5 | 6 | Eva-Marie Håkansson | Sweden | 1:11.14 | NR |
| 6 | 1 | Hiroko Nagasaki | Japan | 1:11.33 | |
| 7 | 2 | Susan Rapp | United States | 1:11.45 | |
| 8 | 3 | Jean Hill | Great Britain | 1:11.82 | |