Themen's 1500 metres event at the1991 IAAF World Indoor Championships was held on 8 and 9 March.
| Gold | Silver | Bronze |
Noureddine Morceli Algeria | Fermín Cacho Spain | Mário Silva Portugal |
First 4 of each heat (Q) and next 2 fastest (q) qualified for the semifinals.[1]
| Rank | Heat | Name | Nationality | Time | Notes |
|---|---|---|---|---|---|
| 1 | 2 | Mário Silva | Portugal | 3:43.70 | Q |
| 2 | 2 | Fermín Cacho | Spain | 3:43.73 | Q |
| 3 | 2 | Abdelaziz Sahere |  Morocco | 3:43.99 | Q |
| 4 | 2 | Han Kulker |  Netherlands | 3:44.04 | Q |
| 5 | 1 | Noureddine Morceli | Algeria | 3:44.06 | Q |
| 6 | 2 | Michael Busch |  Germany | 3:44.57 | q |
| 7 | 1 | Jeff Atkinson |  United States | 3:44.83 | Q |
| 8 | 2 | Terrance Herrington | United States | 3:44.86 | q |
| 9 | 1 | Sergey Melnikov |  Soviet Union | 3:44.91 | Q |
| 10 | 1 | Marcus O'Sullivan |  Ireland | 3:44.91 | Q |
| 11 | 1 | Víctor Rojas | Spain | 3:45.43 | |
| 12 | 1 | Rachid El Basir | Morocco | 3:45.83 | |
| 13 | 1 | Robin van Helden | Netherlands | 3:46.33 | |
| 14 | 1 | David Kibet |  Kenya | 3:47.33 | |
| 15 | 2 | José Moreira | Portugal | 3:47.57 | |
| 16 | 2 | Davide Tirelli |  Italy | 3:47.63 | |
| 17 | 1 | Alemayehu Roba |  Ethiopia | 3:48.83 | |
| 1 | Miroslav Chochkov |  Bulgaria | DNS | ||
| 2 | Jacinto Navarrete |  Colombia | DNS |
| Rank | Name | Nationality | Time | Notes |
|---|---|---|---|---|
 | Noureddine Morceli | Algeria | 3:41.57 | |
 | Fermín Cacho | Spain | 3:42.68 | |
 | Mário Silva | Portugal | 3:43.85 | |
| 4 | Marcus O'Sullivan | Ireland | 3:44.79 | |
| 5 | Han Kulker | Netherlands | 3:45.93 | |
| 6 | Jeff Atkinson | United States | 3:46.25 | |
| 7 | Michael Busch | Germany | 3:46.72 | |
| 8 | Abdelaziz Sahere | Morocco | 3:47.04 | |
| 9 | Terrance Herrington | United States | 3:47.19 | |
| 10 | Sergey Melnikov | Soviet Union | 3:49.78 |
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