The women's 400 metres hurdles event at the 1992 World Junior Championships in Athletics was held in Seoul, Korea, at Olympic Stadium on 16 and 18 September.
| Gold | Georgeta Petrea | |
| Silver | Erica Peterson | |
| Bronze | Winsome Cole |
18 September
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| align=left | align=left | | 58.03 | ||||
| align=left | align=left | | 58.09 | ||||
| align=left | align=left | | 58.15 | ||||
| 4 | align=left | align=left | 58.24 | ||||
| 5 | align=left | align=left | 58.64 | ||||
| 6 | align=left | align=left | 59.27 | ||||
| 7 | align=left | align=left | 59.70 | ||||
| 8 | align=left | align=left | | 60.81 |
16 September
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | 58.65 | Q | |||
| 2 | align=left | align=left | | 59.21 | Q | ||
| 3 | align=left | align=left | 59.40 | q | |||
| 4 | align=left | align=left | 59.97 | ||||
| 5 | align=left | align=left |  | 60.33 | |||
| 6 | align=left | align=left | | 62.38 |
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 58.54 | Q | ||
| 2 | align=left | align=left | | 59.27 | Q | ||
| 3 | align=left | align=left |  | 60.02 | |||
| 4 | align=left | align=left | | 60.43 | |||
| 5 | align=left | align=left |  | 61.17 | |||
| 6 | align=left | align=left | 62.55 | ||||
| 7 | align=left | align=left |  | 64.26 |
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 58.00 | Q | ||
| 2 | align=left | align=left | 58.20 | Q | |||
| 3 | align=left | align=left | 58.95 | q | |||
| 4 | align=left | align=left | | 59.93 | |||
| 5 | align=left | align=left |  | 60.86 | |||
| 6 | align=left | align=left | 63.61 |
According to an unofficial count, 19 athletes from 14 countries participated in the event.