# Athletics at the 1991 Summer Universiade – Men's 400 metres

The men's 400 metres event at the 1991 Summer Universiade was held at the Don Valley Stadium in Sheffield on 20, 21 and 22 July 1991.

## Medalists

| Gold | Silver | Bronze |
| Patrick O'Connor Jamaica | Benyounés Lahlou Morocco | Marlin Cannon United States |

## Results
### Heats

Held on 20 July
| Rank | Heat | Athlete | Nationality | Time | Notes |
| 1 | 7 | Benyounés Lahlou | Morocco | 46.89 | Q |
| 2 | 2 | Shunji Karube | Japan | 47.16 | Q |
| 3 | 2 | Evon Clarke | Jamaica | 47.27 | Q |
| 4 | 4 | Tim Hesse | Ghana | 47.44 | Q |
| 5 | 1 | Gabriel Luke | United States | 47.45 | Q |
| 6 | 3 | Michael Joubert | Australia | 47.50 | Q |
| 7 | 7 | Elieser Wettebosi | Indonesia | 47.63 | Q |
| 7 | 8 | Patrick O'Connor | Jamaica | 47.63 | Q |
| 9 | 1 | Calvin Henry | Great Britain | 47.69 | Q |
| 10 | 7 | Masayoshi Kan | Japan | 47.72 | Q |
| 11 | 4 | Du'aine Ladejo | Great Britain | 47.74 | Q |
| 12 | 8 | Laurent Lebras | France | 47.75 | Q |
| 13 | 6 | Marlin Cannon | United States | 47.83 | Q |
| 14 | 7 | Miguel Cuesta | Spain | 48.02 | q |
| 15 | 8 | Son Jul-il | South Korea | 48.04 | Q |
| 16 | 6 | Riccardo Cardone | Italy | 48.09 | Q |
| 17 | 6 | Joslyn Thomas | Sierra Leone | 48.13 | Q |
| 18 | 4 | Thomas Koech | Kenya | 48.18 | Q |
| 19 | 6 | Vladimir Popov | Soviet Union | 48.33 | q |
| 20 | 3 | Dmitriy Kliger | Soviet Union | 48.36 | Q |
| 21 | 2 | Jens Storhaug | Norway | 48.47 | Q |
| 22 | 5 | Camera Ntereke | Botswana | 48.61 | Q |
| 23 | 8 | Agustín Tello | Spain | 48.64 | q |
| 24 | 3 | Christian Boda | Mauritius | 48.75 | Q |
| 25 | 1 | Gianrico Boncompagni | Italy | 48.82 | Q |
| 26 | 2 | Nuno Alpiarça | Portugal | 49.00 | q |
| 27 | 6 | Moustapha Diarra | Senegal | 49.15 | q |
| 28 | 5 | Ivaylo Vasilev | Bulgaria | 49.17 | Q |
| 29 | 1 | Marius Rooth | Norway | 49.38 | q |
| 30 | 3 | Mohamed Mehdi Hasan | Bangladesh | 49.39 | q |
| 31 | 3 | Ali Faudet | Chad | 49.57 | q |
| 32 | 4 | Manlio Molinari | San Marino | 49.85 | |
| 33 | 5 | Eliud Moreno | Kenya | 50.09 | Q |
| 34 | 2 | Ralph Blaauw | Namibia | 50.43 | |
| 34 | 4 | Dhani Ram Chaudhari | Nepal | 50.43 | |
| 36 | 8 | Bothloke Shebe | Lesotho | 50.60 | |
| 37 | 6 | Dalos Umul | Uganda | 50.62 | |
| 38 | 7 | Hau Yiu Chung | Hong Kong | 50.64 | |
| 39 | 8 | Max Thenu | Indonesia | 50.87 | |
| 40 | 3 | Carlos Madrigal | Costa Rica | 51.73 | |
| 41 | 4 | Mordsen Ruveve | Zambia | 51.88 | |
| 42 | 7 | Bringle Kgabanyane | Botswana | 52.50 | |
| 43 | 8 | Erasmus Nyanga | Zambia | 52.70 | |
| 44 | 3 | Mahamadou Issoufou | Niger | 53.79 | |
| 45 | 2 | Timothy Leone | Malta | 54.40 | |
| 46 | 3 | Faha Sy | Mauritania | 54.44 | |
| 47 | 5 | Kabir Lutful | Bangladesh | 54.72 | |
| 48 | 5 | Ralph Mifsud | Malta | 56.13 | |
| 49 | 5 | S. Sopaseuth | Laos | 57.36 | |
| 50 | 1 | Mohamed Ould Brahim | Mauritania | 1:05.09 | |

### Quarterfinals

Held on 20 July
| Rank | Heat | Athlete | Nationality | Time | Notes |
| 1 | 4 | Evon Clarke | Jamaica | 47.00 | Q |
| 2 | 3 | Tim Hesse | Ghana | 47.06 | Q |
| 2 | 4 | Benyounés Lahlou | Morocco | 47.06 | Q |
| 4 | 3 | Patrick O'Connor | Jamaica | 47.10 | Q |
| 5 | 2 | Gabriel Luke | United States | 47.12 | Q |
| 6 | 2 | Michael Joubert | Australia | 47.17 | Q |
| 7 | 1 | Dmitriy Kliger | Soviet Union | 47.19 | Q |
| 8 | 4 | Ivaylo Vasilev | Bulgaria | 47.22 | Q |
| 9 | 3 | Calvin Henry | Great Britain | 47.29 | Q |
| 10 | 3 | Riccardo Cardone | Italy | 47.36 | Q |
| 11 | 4 | Masayoshi Kan | Japan | 47.56 | Q |
| 12 | 1 | Shunji Karube | Japan | 47.61 | Q |
| 13 | 1 | Marlin Cannon | United States | 47.67 | Q |
| 13 | 2 | Laurent Lebras | France | 47.67 | Q |
| 15 | 2 | Du'aine Ladejo | Great Britain | 47.73 | Q |
| 16 | 4 | Miguel Cuesta | Spain | 47.95 | |
| 17 | 3 | Christian Boda | Mauritius | 48.23 | |
| 18 | 2 | Vladimir Popov | Soviet Union | 48.33 | |
| 19 | 4 | Camera Ntereke | Botswana | 48.38 | |
| 20 | 3 | Agustín Tello | Spain | 48.39 | |
| 21 | 1 | Gianrico Boncompagni | Italy | 48.40 | Q |
| 21 | 3 | Joslyn Thomas | Sierra Leone | 48.40 | |
| 23 | 2 | Thomas Koech | Kenya | 48.50 | |
| 24 | 1 | Jens Storhaug | Norway | 48.55 | |
| 25 | 3 | Marius Rooth | Norway | 48.58 | |
| 26 | 4 | Eliud Moreno | Kenya | 48.59 | |
| 27 | 2 | Nuño Alpiarça | Portugal | 49.36 | |
| | ? | Mohamed Mehdi Hasan | Bangladesh | ? | |
| | ? | Ali Faudet | Chad | ? | |
| | ? | Elieser Wettebosi | Indonesia | ? | |
| | ? | Moustapha Diarra | Senegal | ? | |
| | ? | Son Jul-il | South Korea | ? | |

### Semifinals

Held on 21 July
| Rank | Heat | Athlete | Nationality | Time | Notes |
| 1 | 2 | Gabriel Luke | United States | 45.98 | Q |
| 2 | 1 | Dmitriy Kliger | Soviet Union | 46.11 | Q |
| 3 | 1 | Marlin Cannon | United States | 46.12 | Q |
| 4 | 2 | Patrick O'Connor | Jamaica | 46.18 | Q |
| 5 | 1 | Benyounés Lahlou | Morocco | 46.23 | Q |
| 6 | 2 | Michael Joubert | Australia | 46.37 | Q |
| 7 | 2 | Calvin Henry | Great Britain | 46.60 | Q |
| 8 | 1 | Shunji Karube | Japan | 46.62 | Q |
| 9 | 2 | Tim Hesse | Ghana | 46.66 | |
| 10 | 1 | Evon Clarke | Jamaica | 46.68 | |
| 11 | 1 | Ivaylo Vasilev | Bulgaria | 46.92 | |
| 12 | 2 | Riccardo Cardone | Italy | 46.99 | |
| 13 | 2 | Laurent Lebras | France | 47.29 | |
| 14 | 2 | Masayoshi Kan | Japan | 47.34 | |
| 15 | 1 | Du'aine Ladejo | Great Britain | 47.63 | |
| 16 | 1 | Gianrico Boncompagni | Italy | 48.44 | |

### Final

Held on 22 July
| Rank | Athlete | Nationality | Time | Notes |
| | Patrick O'Connor | Jamaica | 45.52 | |
| | Benyounés Lahlou | Morocco | 45.55 | PB |
| | Marlin Cannon | United States | 45.78 | |
| 4 | Dmitriy Kliger | Soviet Union | 46.24 | |
| 5 | Shunji Karube | Japan | 46.49 | |
| 6 | Calvin Henry | Great Britain | 46.51 | |
| | Gabriel Luke | United States | DQ | |
| | Michael Joubert | Australia | DQ | |