Many neoclassical-style theatres have been restored or renovated this century throughout the world, but few have had to be recovered after being rendered unusable
by an earthquake. In the case of the Municipal Theatre of Viña del Mar, located in the region of Valparaíso in Chile, it withstood an earthquake in 1985 of an intensity of VIII (destructive) on the Mercalli scale, but it did not resist the earthquake of 2010 of an intensity of XIX (violent), leaving the theatre badly damaged. This essay presents the project that won the architecture competition and the works carried out for the structural consolidation and the architectural and artistic restoration of its elements, as well as the new building incorporated into the complex declared a National Monument, in order to preserve its attributes, increase its heritage value and meet the demands of a space for entertainment and culture in the present century.