The men's 1500 metres event at the 2004 World Junior Championships in Athletics was held in Grosseto, Italy, at Stadio Olimpico Carlo Zecchini on 13 and 15 July.
| Gold | Abdalaati Iguider | |
| Silver | Benson Esho | |
| Bronze | Brimin Kipruto |
15 July
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| align=left | align=left | | 3:35.53 | ||||
| align=left | align=left | | 3:35.80 | ||||
| align=left | align=left | | 3:35.96 | ||||
| 4 | align=left | align=left | | 3:37.44 | |||
| 5 | align=left | align=left | 3:43.19 | ||||
| 6 | align=left | align=left | 3:43.31 | ||||
| 7 | align=left | align=left |  | 3:43.35 | |||
| 8 | align=left | align=left |  | 3:43.62 | |||
| 9 | align=left | align=left |  | 3:45.90 | |||
| 10 | align=left | align=left |  | 3:48.12 | |||
| 11 | align=left | align=left | 3:51.71 | ||||
| align=left | align=left |  | DNF |
13 July
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 3:43.96 | Q | ||
| 2 | align=left | align=left | 3:46.07 | Q | |||
| 3 | align=left | align=left | | 3:46.46 | Q | ||
| 4 | align=left | align=left |  | 3:48.12 | |||
| 5 | align=left | align=left | | 3:49.02 | |||
| 6 | align=left | align=left | 3:49.78 | ||||
| 7 | align=left | align=left | 3:50.51 | ||||
| 8 | align=left | align=left | | 3:54.22 | |||
| 9 | align=left | align=left | 3:58.84 | ||||
| 10 | align=left | align=left | 4:01.99 | ||||
| 11 | align=left | align=left |  | 4:15.30 | |||
| align=left | align=left |  | DQ | IAAF rule 163.2 | |||
| align=left | align=left | DNF |
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 3:42.08 | Q | ||
| 2 | align=left | align=left | | 3:42.31 | Q | ||
| 3 | align=left | align=left | 3:42.48 | Q | |||
| 4 | align=left | align=left | | 3:42.49 | q | ||
| 5 | align=left | align=left | | 3:45.23 | q | ||
| 6 | align=left | align=left |  | 3:46.60 | |||
| 7 | align=left | align=left |  | 3:47.08 | |||
| 8 | align=left | align=left |  | 3:49.42 | |||
| 9 | align=left | align=left | | 3:50.12 | |||
| 10 | align=left | align=left |  | 3:50.68 | |||
| 11 | align=left | align=left | 3:53.40 | ||||
| 12 | align=left | align=left | 4:03.03 |
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 3:45.43 | Q | ||
| 2 | align=left | align=left | | 3:45.82 | Q | ||
| 3 | align=left | align=left | 3:46.13 | Q | |||
| 4 | align=left | align=left | | 3:46.60 | q | ||
| 5 | align=left | align=left | | 3:47.75 | |||
| 6 | align=left | align=left |  | 3:49.51 | |||
| 7 | align=left | align=left | | 3:51.96 | |||
| 8 | align=left | align=left | | 3:54.75 | |||
| 9 | align=left | align=left | | 3:54.82 | |||
| 10 | align=left | align=left | 4:10.61 | ||||
| 11 | align=left | align=left |  | 4:27.27 | |||
| 12 | align=left | align=left |  | 4:28.05 |
According to an unofficial count, 37 athletes from 25 countries participated in the event.