Miss República Dominicana 1991 was held on August 21, 1990 at the Auditorio de la Tasita de Plata at Hotel Eurotel Beach Resort & Casino in San Felipe de Puerto Plata, Dominican Republic, with 30 delegates competing. Melissa Carolina Vargas Cardona (Santiago) won and represented the country at Miss Universe 1991. Rosanna Rodríguez (La Vega) was Miss World Dominican Republic for Miss World 1991, and Lisa Córdoba (Hato Mayor) was Miss Dominican Republic International for Miss International 1991, though immigration issues prevented her from attending, so the winner took her place. Other semifinalists were assigned to various international pageants.