The men's 1500 metres event at the 2003 IAAF World Indoor Championships was held on 14–15 March 2003.
The winning margin was 0.03 seconds which as of July 2024 remains the joint-narrowest winning margin in the men's 1500 metres at these championships.
| width=200 bgcolor=gold | Gold | width=200 bgcolor=silver | Silver | width=200 bgcolor=CC9966 | Bronze |
| Driss Maazouzi | Bernard Lagat | Abdelkader Hachlaf |
First 2 of each heat (Q) and next 3 fastest (q) qualified for the semifinals.
| Rank | Heat | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 2 | 3:39.97 | Q | ||||
| 2 | 3:40.40 | Q | ||||
| 2 | 3:40.61 | q | ||||
| 2 | 3:40.80 | q, SB | ||||
| 2 | 3:40.85 | q | ||||
| 2 | 3:40.89 | PB | ||||
| 3 | 3:41.08 | Q | ||||
| 2 | 3:41.18 | PB | ||||
| 3 | 3:41.37 | Q, SB | ||||
| 10 | 3 | 3:41.85 | SB | |||
| 11 | 3 | 3:41.99 | ||||
| 12 | 3 | 3:42.88 | ||||
| 13 | 3 | 3:43.31 | ||||
| 14 | 3 | 3:43.97 | ||||
| 15 | 3 | 3:44.37 | ||||
| 16 | 2 | 3:45.93 | ||||
| 17 | 2 | 3:46.99 | ||||
| 18 | 1 | 3:48.36 | Q | |||
| 19 | 1 | 3:48.39 | Q | |||
| 20 | 1 | 3:48.41 | ||||
| 21 | 1 | 3:48.65 | ||||
| 22 | 1 | 3:48.71 | ||||
| 23 | 1 | 3:49.31 | ||||
| 24 | 1 | 3:49.39 | ||||
| 25 | 1 | 3:50.86 | ||||
| 26 | 3 | 4:15.51 | NR |
| Rank | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|
| 3:42.59 | |||||
| 3:42.62 | |||||
| 3:42.71 | |||||
| 4 | 3:43.03 | ||||
| 5 | 3:44.56 | ||||
| 6 | 3:44.67 | ||||
| 7 | 3:44.80 | ||||
| 8 | 3:44.81 | ||||
| 9 | 3:47.44 |