Teatro Juan Ruiz de Alarcón, Theatre building at National Autonomous University, Mexico City, Mexico.

Teatro Juan Ruiz de Alarcón is one of the main university theatres of the Centro Cultural Universitario of UNAM in Mexico City. It was designed as an Italian-style theatre with a stage house by architects Orso Núñez and Arcadio Artis Espriú, and it shares its building with the Sala Sor Juana Inés de la Cruz.

The theatre was commissioned by rector Guillermo Soberón Acevedo and built between 1977 and 1978, designed as an Italian-style theatre with a stage house by architects Orso Núñez and Arcadio Artis Espriú. It opened on 26 February 1976 with Juan José Gurrola's staging of Juan Ruiz de Alarcón's La prueba de las promesas. It shares its building with the Sala Sor Juana Inés de la Cruz, and both venues host the UNAM International University Theatre Festival.

The theatre is named after Juan Ruiz de Alarcón, a Golden Age playwright born in New Spain, and its first performance was his play La prueba de las promesas, directed by Juan José Gurrola. It shares its building with the Sala Sor Juana Inés de la Cruz, named after another Mexican writer of the same era. Both venues host the annual International University Theatre Festival of UNAM.

The theatre is located within a university campus, so planning ahead helps with finding parking and checking campus access procedures. Arriving early allows visitors to explore the surroundings and secure good seating, since the venue has limited capacity.

The theatre shares its building with a second stage named after Sor Juana Inés de la Cruz, and both venues plus their adjoining spaces host the UNAM International University Theatre Festival each year. Its opening performance was La prueba de las promesas by Juan Ruiz de Alarcón, directed by Juan José Gurrola.