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.The following records were established during the competition:
| Date | Round | Name | Nation | Time | Record |
| 2 August | Final A | Petra van Staveren | 1:09.88 |
Results
Heats
Rule: The eight fastest swimmers advance to final A, while the next eight to final B.| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 2 | 5 | Catherine Poirot | 1:10.69 | Q, NR | |
| 2 | 3 | 4 | Petra van Staveren | 1:11.18 | Q | |
| 3 | 2 | 2 | Jean Hill | 1:11.37 | Q | |
| 4 | 4 | 3 | Eva-Marie Håkansson | 1:11.41 | Q | |
| 5 | 4 | 5 | Susan Rapp | 1:11.63 | Q | |
| 6 | 2 | 4 | Anne Ottenbrite | 1:11.81 | Q | |
| 7 | 4 | 4 | Hiroko Nagasaki | 1:11.82 | Q | |
| 8 | 1 | 4 | Tracy Caulkins | 1:11.99 | Q | |
| 9 | 3 | 2 | Ingrid Lempereur | 1:12.08 | q | |
| 10 | 1 | 3 | Ute Hasse | 1:12.17 | q | |
| 10 | 2 | 6 | Dimity Douglas | 1:12.17 | q | |
| 12 | 1 | 5 | Lisa Borsholt | 1:12.24 | q | |
| 13 | 3 | 3 | Angelika Knipping | 1:12.41 | q | |
| 14 | 2 | 7 | Patricia Brülhart | 1:12.44 | q | |
| 15 | 4 | 6 | Annelie Holmström | 1:12.60 | q | |
| 16 | 2 | 3 | Carlotta Tagnin | 1:12.70 | q | |
| 17 | 1 | 6 | Sandra Bowman | 1:12.92 | ||
| 18 | 3 | 7 | Sharon Kellett | 1:13.43 | ||
| 19 | 1 | 2 | Petra Hillenius | 1:14.09 | ||
| 20 | 4 | 2 | Liang Weifen | 1:14.38 | ||
| 21 | 3 | 6 | Alicia María Boscatto | 1:14.45 | ||
| 22 | 4 | 7 | Kaori Iwasaki | 1:14.68 | ||
| 23 | 4 | 1 | Sara Guido | 1:14.69 | ||
| 24 | 1 | 7 | Maarit Vähäsaari-Sihvonen | 1:14.85 | ||
| 25 | 3 | 1 | Guðrún Ágústsdóttir | 1:16.70 | ||
| 26 | 2 | 1 | Rosa María Silva | 1:17.11 | ||
| 27 | 1 | 1 | Chow Lai Yee | 1:17.92 | ||
| 28 | 4 | 8 | Helen Chow | 1:18.99 | ||
| 29 | 3 | 8 | Isabel Lardizábal | 1:25.12 | ||
| 3 | 5 | Manuela Dalla Valle |