The men's 1500 metres event at the 2000 World Junior Championships in Athletics was held in Santiago, Chile, at Estadio Nacional Julio Martínez Prádanos on 20 and 22 October.
| Gold | Cornelius Chirchir | |
| Silver | Wolfram Müller | |
| Bronze | Philemon Tanui |
22 October
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| align=left | align=left | | 3:38.80 | ||||
| align=left | align=left | 3:39.37 | |||||
| align=left | align=left | | 3:40.77 | ||||
| 4 | align=left | align=left |  | 3:42.27 | |||
| 5 | align=left | align=left | 3:42.52 | ||||
| 6 | align=left | align=left |  | 3:43.34 | |||
| 7 | align=left | align=left | | 3:44.12 | |||
| 8 | align=left | align=left | 3:44.46 | ||||
| 9 | align=left | align=left |  | 3:44.76 | |||
| 10 | align=left | align=left |  | 3:45.51 | |||
| 11 | align=left | align=left | | 3:50.19 | |||
| align=left | align=left |  | DNS |
20 October
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 3:47.48 | Q | ||
| 2 | align=left | align=left | 3:47.86 | Q | |||
| 3 | align=left | align=left | 3:47.89 | Q | |||
| 4 | align=left | align=left | 3:48.99 | ||||
| 5 | align=left | align=left |  | 3:49.25 | |||
| 6 | align=left | align=left | 3:50.10 | ||||
| 7 | align=left | align=left |  | 3:51.75 | |||
| 8 | align=left | align=left |  | 3:53.41 | |||
| 9 | align=left | align=left |  | 3:55.74 | |||
| 10 | align=left | align=left |  | 4:02.85 | |||
| 11 | align=left | align=left | 4:27.48 |
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 3:44.89 | Q | ||
| 2 | align=left | align=left | | 3:45.16 | Q | ||
| 3 | align=left | align=left | | 3:45.71 | Q | ||
| 4 | align=left | align=left | 3:45.88 | q | |||
| 5 | align=left | align=left | | 3:46.67 | q | ||
| 6 | align=left | align=left |  | 3:49.66 | |||
| 7 | align=left | align=left | 3:54.07 | ||||
| 8 | align=left | align=left | 3:54.34 | ||||
| 9 | align=left | align=left | | 3:58.50 | |||
| 10 | align=left | align=left |  | 4:03.11 | |||
| 11 | align=left | align=left | 4:12.45 | ||||
| 12 | align=left | align=left |  | 4:54.37 | |||
| align=left | align=left | DQ |
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 3:46.53 | Q | ||
| 2 | align=left | align=left | | 3:46.86 | Q | ||
| 3 | align=left | align=left | | 3:46.94 | Q | ||
| 4 | align=left | align=left | | 3:47.59 | q | ||
| 5 | align=left | align=left |  | 3:47.98 | |||
| 6 | align=left | align=left |  | 3:49.68 | |||
| 7 | align=left | align=left | | 3:51.24 | |||
| 8 | align=left | align=left |  | 3:52.69 | |||
| 9 | align=left | align=left | 3:56.74 | ||||
| 10 | align=left | align=left | 4:07.98 | ||||
| 11 | align=left | align=left | 4:08.05 | ||||
| 12 | align=left | align=left | 4:15.37 | ||||
| 13 | align=left | align=left |  | 4:51.29 |
According to an unofficial count, 37 athletes from 32 countries participated in the event.