The women's 400 metres hurdles event at the 2002 World Junior Championships in Athletics was held in Kingston, Jamaica, at National Stadium on 17 and 19 July.
| Gold | Lashinda Demus | |
| Silver | Melaine Walker | |
| Bronze | Camille Robinson |
19 July
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| align=left | align=left | | 54.70 | ||||
| align=left | align=left | | 56.03 | ||||
| align=left | align=left | | 56.14 | ||||
| 4 | align=left | align=left | | 56.52 | |||
| 5 | align=left | align=left |  | 58.42 | |||
| 6 | align=left | align=left |  | 58.46 | |||
| 7 | align=left | align=left | 58.60 | ||||
| 8 | align=left | align=left |  | 59.97 |
17 July
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 57.38 | Q | ||
| 2 | align=left | align=left | | 57.71 | Q | ||
| 3 | align=left | align=left | | 59.07 | q | ||
| 4 | align=left | align=left | 59.25 | q | |||
| 5 | align=left | align=left |  | 60.74 | |||
| 6 | align=left | align=left |  | 60.85 |
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 59.54 | Q | ||
| 2 | align=left | align=left | | 59.83 | Q | ||
| 3 | align=left | align=left | | 59.93 | |||
| 4 | align=left | align=left | 60.53 | ||||
| 5 | align=left | align=left |  | 61.11 | |||
| 6 | align=left | align=left |  | 61.80 | |||
| 7 | align=left | align=left | | 63.15 |
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 57.39 | Q | ||
| 2 | align=left | align=left | | 59.31 | Q | ||
| 3 | align=left | align=left | | 59.43 | |||
| 4 | align=left | align=left | 59.98 | ||||
| 5 | align=left | align=left | 61.27 | ||||
| 6 | align=left | align=left |  | 62.97 |
According to an unofficial count, 19 athletes from 12 countries participated in the event.