Rossio Square is the popular name of the Pedro IV Square (Portuguese: Praça de D. Pedro IV) in the city of Lisboa. It is located in the Pombaline Downtown of Lisbon and has been one of its main squares since the Middle Ages.

The Rossio has been a meeting place for people of Lisbon for centuries. Some of the cafés and shops of the square date from the 18th century. The building of the Maria II Theatre and the Public Gardens to the north of the square only made the area more attended by Lisbon high society in the 19th century.