The São Carlos National Theatre is a prominent opera house located in Lisbon, Portugal. Opened in 1793, it is known for its neoclassical architecture and elegant interior design. The theatre serves as the main venue for opera performances in the country and has a rich history of hosting both national and international productions. The theatre underwent significant renovations in the 20th century, enhancing its facilities and acoustics. It is home to the Portuguese National Opera and regularly features concerts, ballets, and other cultural events. The São Carlos National Theatre remains a vital part of Lisbon's cultural landscape.