Miss República Dominicana 1990 was held on 1 de septiembre de 1989 in Santo Domingo, República Dominicana, with 32 delegates. Rosario del Carmen Rodríguez del Rosario (Distrito Nacional) won and represented the country at Miss Universo 1990. Brenda Marte was Miss Mundo Dominicana (to Miss Mundo 1990), Vivian Calderón was Miss República Dominicana Internacional (to Miss Internacional 1990), Lizbeth Santana was Miss Belleza Internacional Dominicana (to Nuestra Belleza Internacional 1990), and María Isabel de León was Miss América Latina Dominicana (to Miss América Latina 1990). Other semifinalists competed in various international pageants.