Swimming at the 1984 Summer Olympics – Women's 400 metre freestyle
The final of the women's 400 metre freestyle event at the 1984 Summer Olympics was held in the McDonald's Olympic Swim Stadium in Los Angeles, California, on July 31, 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 |
| 31 July | Final A | Tiffany Cohen | | 4:07.10 | |
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 | 4 | 4 | Tiffany Cohen | | 4:11.49 | Q |
| 2 | 4 | 5 | Sarah Hardcastle | | 4:11.55 | Q, NR |
| 3 | 3 | 4 | Kim Linehan | | 4:15.08 | Q |
| 4 | 3 | 3 | Anna McVann | | 4:15.21 | Q |
| 5 | 2 | 4 | June Croft | | 4:15.51 | Q |
| 6 | 2 | 3 | Julie Daigneault | | 4:16.60 | Q |
| 7 | 2 | 5 | Jolande van der Meer | | 4:16.65 | Q |
| 8 | 4 | 3 | Birgit Kowalczik | | 4:17.92 | Q |
| 9 | 3 | 6 | Ann Linder | | 4:18.28 | q |
| 10 | 1 | 6 | Monica Olmi | | 4:18.70 | q |
| 11 | 1 | 5 | Carla Lasi | | 4:18.90 | q |
| 12 | 1 | 4 | Ina Beyermann | | 4:18.94 | q, |
| 13 | 4 | 6 | Donna McGinnis | | 4:19.48 | q |
| 14 | 4 | 2 | Chikako Nakamori | | 4:20.13 | q, NR |
| 15 | 3 | 5 | Susie Baumer | | 4:20.69 | q |
| 16 | 3 | 7 | Lisa Ann Wen | | 4:23.30 | q |
| 17 | 2 | 2 | Irma Huerta | | 4:25.13 | q |
| 18 | 3 | 2 | Nadia Krüger | | 4:28.20 | |
| 19 | 2 | 6 | Junko Sakurai | | 4:28.68 | |
| 20 | 1 | 3 | Sofia Dara | | 4:31.76 | |
| 21 | 1 | 2 | Hadar Rubinstein | | 4:34.95 | |
| 22 | 4 | 1 | Carol Ann Heavey | | 4:36.07 | |
| 23 | 3 | 1 | Karen Slowing-Aceituno | | 4:36.87 | |
| 24 | 1 | 7 | Chang Hui-chien | | 4:42.47 | |
| 25 | 4 | 7 | Fenella Ng | | 4:43.41 | |
| 2 | 7 | Faten Ghattas | | | |
Finals
Final B
Final A
