Señorita República Dominicana 1978 was held on December 14, 1977. There were 28 candidates who competed for the national crown. The winner represented the Dominican Republic at the Miss Universe 1978. The Señorita República Dominicana Mundo will enter Miss World 1978. Only contestants for 27 provinces and one municipality entered. For the top 10 they showed their evening gown and answered questions so they could go to the top 5. In the top 5 they answered more questions.

Results

• Señorita República Dominicana 1978: Raquel Josefina Jacobo Jaar (María Trinidad Sánchez)
• Señorita República Dominicana Mundo: Jenny del Carmen Polanco Rivera† (Puerto Plata)
• 1st Runner Up: Caridad Cabrera (San Cristóbal)
• 2nd Runner Up: Aurora Rodríguez (La Altagracia)
• 3rd Runner Up: Isaura Medina (Santiago)

Top 10

• Isabel Hoepelman (Distrito Nacional)
• María de Jesus (Barahona)
• Janet Williams (La Romana)
• Sandra Suarez (Salcedo)
• Andreina Fontan (Duarte)

Special awards

• Miss Rostro Bello: Caridad Cabrera (San Cristóbal)
• Miss Photogenic (voted by press reporters): Milka Taveras (Espaillat)
• Miss Congeniality (voted by Miss Dominican Republic Universe contestants): Maria Luisa Hernandez (Santiago Rodríguez)
• Best Provincial Costume: Fiorela Ramírez (Pedernales)

Delegates