The men's 400 metres event at the 1991 IAAF World Indoor Championships was held on 8, 9 and 10 March.
Medalists
| Gold | Silver | Bronze |
Devon Morris Jamaica
|
Samson Kitur Kenya
|
Cayetano Cornet Spain
|
Results
Heats
First 2 of each heat (Q) and next 4 fastest (q) qualified for the semifinals.[1]
| Rank | Heat | Name | Nationality | Time | Notes |
|---|---|---|---|---|---|
| 1 | 1 | Ian Morris |  Trinidad and Tobago |
47.03 | Q |
| 2 | 2 | Samson Kitur | Kenya |
47.04 | Q |
| 3 | 1 | Cayetano Cornet | Spain |
47.11 | Q |
| 3 | 2 | Howard Burnett | Jamaica |
47.11 | Q |
| 5 | 3 | Charles Jenkins Jr. |  United States |
47.17 | Q |
| 6 | 2 | Raymond Pierre | United States |
47.18 | q |
| 7 | 4 | Alvin Daniel | Trinidad and Tobago |
47.19 | Q |
| 8 | 3 | Devon Morris | Jamaica |
47.28 | Q |
| 9 | 4 | Antonio Sánchez | Spain |
47.33 | Q |
| 10 | 4 | Mark Garner |  Australia |
47.52 | q |
| 11 | 4 | Abdelali Kasbane |  Morocco |
47.56 | q, NR |
| 12 | 1 | Paul Greene | Australia |
47.67 | q |
| 13 | 3 | Amar Hecini |  Algeria |
47.95 | |
| 14 | 1 | Christopher Nibilo |  Tanzania |
48.40 | NR |
| 15 | 1 | Benyounés Lahlou | Morocco |
48.94 | |
| 16 | 4 | Roberto Bortolotto |  Brazil |
49.07 | |
| 17 | 2 | Christian Boda |  Mauritius |
49.47 | |
| 18 | 3 | Inaldo Justino Sena | Brazil |
49.49 | |
| 19 | 2 | Julio Caballero |  Paraguay |
50.95 | NR |
| 2 | Dmitriy Golovastov |  Soviet Union |
DNF | ||
| 3 | Desi Wynter |  United States Virgin Islands |
DQ | ||
| 1 | Ali Faudet |  Chad |
DNS | ||
| 3 | Morris Okinda | Tanzania |
DNS | ||
| 4 | Ahmed Abdelhalim Ghanem |  Egypt |
DNS |
Semifinals
First 3 of each semifinal (Q) qualified directly for the final.[2]
| Rank | Heat | Name | Nationality | Time | Notes |
|---|---|---|---|---|---|
| 1 | 1 | Devon Morris | Jamaica |
46.30 | Q |
| 2 | 2 | Samson Kitur | Kenya |
46.43 | Q, NR |
| 3 | 1 | Charles Jenkins Jr. | United States |
46.55 | Q |
| 4 | 2 | Howard Burnett | Jamaica |
46.62 | Q |
| 5 | 1 | Cayetano Cornet | Spain |
46.69 | Q |
| 6 | 2 | Alvin Daniel | Trinidad and Tobago |
47.03 | Q |
| 7 | 1 | Abdelali Kasbane | Morocco |
47.05 | NR |
| 8 | 1 | Mark Garner | Australia |
47.06 | |
| 9 | 2 | Paul Greene | Australia |
47.20 | |
| 10 | 2 | Raymond Pierre | United States |
47.51 | |
| 11 | 2 | Antonio Sánchez | Spain |
47.59 | |
| 1 | Ian Morris | Trinidad and Tobago |
DNF |
Final
| Rank | Name | Nationality | Time | Notes |
|---|---|---|---|---|
 |
Devon Morris | Jamaica |
46.17 | PB |
 |
Samson Kitur | Kenya |
46.21 | NR |
 |
Cayetano Cornet | Spain |
46.52 | |
| 4 | Charles Jenkins Jr. | United States |
47.18 | |
| 5 | Howard Burnett | Jamaica |
47.84 | |
| 6 | Alvin Daniel | Trinidad and Tobago |
1:32.39 |