Plaza Mayor, also known as Plaza de Armas, is the historic main square of Lima, the capital of Peru. The square is located in the heart of Lima's historic center and is surrounded by important buildings such as the Government Palace, the Cathedral of Lima, the Archbishop's Palace, and the City Hall. It has been the center of Lima since its foundation in 1535 by the Spanish conquistador Francisco Pizarro.

The plaza has played an important role in the history of Lima and Peru. During the colonial period, the square was the site of public events, religious ceremonies, and the Inquisition. It was also the location of the first public water fountain, constructed in 1650, and the first public lighting, installed in 1746.

Today, the square is a popular destination for tourists and locals alike. It is a vibrant and lively space, surrounded by restaurants, cafes, and street performers. Visitors can also find a tourist information center, offering information on the history and culture of Lima, as well as guided tours of the area.