| Winner: | Melissa Carolina Vargas Cardona |
| Represented: | Santiago |
| Date: | August 21, 1991 |
| Venue: | Hotel Euroctel, Puerto Plata, Dominican Republic |
| Next Pageant: | Miss Universe 1991 |
| Broadcaster: | Rahintel Canal 7 |
| Debuts: | Hato Mayor |
| Entrants: | 25 |
Miss República Dominicana 1991 was held on August 21, 1991. There were 24 candidates, representing provinces and municipalities, who entered. The winner would represent the Dominican Republic at Miss Universe 1991 and Miss International 1991. The first runner up would enter Miss World 1991. The second runner up would enter in Miss América Latina 1991. The remaining finalists entered different pageants.
| Final Results | Contestant | |
|---|---|---|
| Miss República Dominicana 1991 |
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| 1st Runner-up |
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| 2nd Runner-up |
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| 3rd Runner-up |
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| 4th Runner-up |
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| Semi-finalists |
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| Represented | Contestant | Age | Height | Hometown | |
|---|---|---|---|---|---|
| Christina Marlene Almanzar Fiallo | 21 | 1.76 | Santo Domingo | ||
| Alexandra Lorein Reyes Fustran | 19 | 1.77 | Santo Domingo | ||
| Ana Miguelina Rosario Tavarez | 23 | 1.73 | San Pedro de Macorís | ||
| Sarah Carolina Toledo Medrán | 17 | 1.80 | Pedro Brand | ||
| Viedma Estrella Collado Zaragoza | 20 | 1.83 | Santo Domingo | ||
| Laura Mary Longo Hidalgo | 19 | 1.70 | Santo Domingo | ||
| Elizabeth Aimeé de los Santos Cruz | 24 | 1.83 | Santo Domingo | ||
| Lisa Ericka Córdoba Melilla | 17 | 1.68 | Hato Mayor del Rey | ||
| Ana María Cacénarez Báez | 22 | 1.84 | Santo Domingo | ||
| Aliesca Alejandrina Sánchez de Rojas | 21 | 1.77 | Santo Domingo | ||
| Joana Miledis Baltazar Moreno | 25 | 1.72 | La Romana | ||
| Rosanna Patricia Rodríguez Portalatín | 18 | 1.79 | Concepción de La Vega | ||
| Josefina Matos | 20 | 1.80 | Santiago | ||
| Yanina María Camacho Moncada | 18 | 1.71 | Moca | ||
| Sandra Mercede Rodriguez Tavarez | 19 | 1.70 | Baní | ||
| Aurora Liz Rosario Hollingberry | 19 | 1.76 | Altamira | ||
| Martha Mercedes Durán de Espinal | 19 | 1.77 | Tenares | ||
| Ada Margarita Ynoa Williams | 22 | 1.74 | Santa Bárbara de Samaná | ||
| Nina Yanilsa de Paula Martín | 17 | 1.80 | San Cristóbal | ||
| Geanina Odelize Xavier de Lara | 24 | 1.78 | Santo Domingo | ||
| Lissette Viviana de Villanueva Sosa | 21 | 1.79 | San Pedro de Macorís | ||
| Melissa Carolina Vargas Cardona | 17 | 1.69 | Santiago de los Caballeros | ||
| Caroli Edith Monsiel Gough | 22 | 1.73 | Santo Domingo | ||
| Stephanie María Olbino de la Rosa | 17 | 1.81 | Santo Domingo | ||
| Edita Marienne Santana Mora | 23 | 1.70 | Santo Domingo |