Miss Universe 1991| Miss Universe 1991 |
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| Tanggal | 17 Mei 1991 |
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| Tempat | Aladdin Theatre for the Performing Arts, Las Vegas, Nevada, Amerika Serikat |
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| Pembawa acara | Dick Clark, Leeza Gibbons dan Angela Visser |
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| Stasiun televisi | CBS |
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| Kontestan | 73 |
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| Semifinalis | 10 |
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| Debut | Bulgaria, Ghana, Romania, Britania Raya |
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| Tidak berkompetisi | Aruba, Australia, Austria, Denmark, Mesir, Inggris, Gibraltar, Greenland, Honduras, Kenya, Selandia Baru, Portugal, Skotlandia, Swiss, Wales |
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| Berkompetisi kembali | Belgia, Brasil, Kep. Cook, Curaçao, Lebanon, Luksemburg, Namibia, Nikaragua, Panama, Kep. VIrgin AS, Yugoslavia |
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| Pemenang | Lupita Jones  Meksiko |
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| Persahabatan | Monique Lindesay
 Kep. Virgin AS |
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| Kostum Nasional Terbaik | Maribel Gutiérrez
 Kolombia |
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| Fotogenik | Siobhan McLafferty
 Irlandia |
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Miss Universe 1991 adalah kontes kecantikan Miss Universe yang diadakan ke-40 kalinya pada tanggal 17 Mei 1991 di Aladdin Theatre for the Performing Arts, Las Vegas, Amerika Serikat.
Lupita Jones dari Meksiko menjuarai kontes tersebut.
Juri
- José Luis RodrÃguez "El Puma" – Penyanyi dan aktor Venezuela
- Janet Hubert – Aktris Amerika
- Kuh Ledesma – Penyanyi jazz Filipina
- Jorge Rivero – Aktor
- Barbara Lauren – Casting director
- Cristophe – Penata rambut Belgia
- Dustin Nguyen – Aktor Vietnam-Amerika
- Nadia Comăneci
Hasil
| Utama |
| Gelar |
Kontestan |
| Miss Universe 1991 | Â Meksiko - Lupita Jones |
| Runner-up 1 | Â Belanda - Pauline Huizinga |
| Runner-up 2 | Â Uni Soviet - Yulia Lemigova |
| 6 Besar |
|
| 10 Besar |
|
| Penghargaan khusus |
| Gelar |
Kontestan |
| Miss Congeniality | Â Kep. Virgin AS - Monique Lindesay |
| Miss Photogenic | Â Irlandia - Siobhan McClafferty |
| Best National Costume |
|
Penilaian semifinal
- Â Juara
- Â Runner-up 1
- Â Runner-up 2
- Â Top 6
- Â Top 10
- (#) Ranking pada tiap babak
| Delegate |
Swimsuit |
Interview |
Evening Gown |
Average |
 Meksiko | 9.450 (1) | 9.608 (1) | 9.758 (1) | 9.605 (1) |
 Venezuela | 9.412 (2) | 9.533 (4) | 9.650 (3) | 9.532 (2) |
 USSR | 9.225 (3) | 9.550 (3) | 9.717 (2) | 9.497 (3) |
 Belanda | 9.073 (6) | 9.592 (2) | 9.600 (4) | 9.422 (4) |
 Jamaika | 9.213 (4) | 9.418 (6) | 9.542 (7) | 9.391 (5) |
 USA | 8.950 (7) | 9.425 (5) | 9.542 (7) | 9.306 (6) |
 Curaçao | 9.135 (5) | 9.190 (8) | 9.550 (6) | 9.292 (7) |
 Paraguay | 8.897 (8) | 9.350 (7) | 9.350 (10) | 9.229 (8) |
 Prancis | 8.867 (10) | 9.067 (10) | 9.590 (5) | 9.175 (9) |
 Yugoslavia | 8.875 (9) | 9.167 (9) | 9.442 (9) | 9.161 (10) |