Miss Perú 1990 was the 36th edition of the Miss Perú pageant, held in 1990 to select the country's representative to the Miss Universe 1990 competition. The event culminated in the crowning of Marisol Castro Gamarra as Miss Perú.
The pageant took place in Lima, Peru, featuring delegates from various regions and departments of the country. Marisol Castro Gamarra, representing Miss Perú Amazonas, was ultimately crowned the winner. She subsequently represented Peru at the Miss Universe 1990 pageant, which was held in Los Angeles, California, United States.
While the primary title of Miss Perú typically designates the representative for Miss Universe, other titles and runners-up are often selected during the same event or in separate but related competitions, to represent Peru in other major international pageants like Miss World or Miss International. For the 1990 edition, Marisol Castro Gamarra's victory marked her as the nation's premier beauty ambassador for the Miss Universe platform that year.