The Plaza San Martín is one of the most representative public spaces of the city of Lima, Peru. It is located at the ninth block of Colmena avenue, within the Historic Centre of Lima which was declared a World Heritage Site in 1988 by UNESCO. It is located near the Plaza Mayor of Lima and is connected to it by the Jiron de la Union. Its central monument gives homage to Peru's liberator, José de San Martín.

The Historic Centre of Lima is the historic city centre of the city of Lima, the capital of Peru. Located in the city's districts of Lima and Rímac, both in the Rímac Valley, it consists of two areas: the first is the Monumental Zone established by the Peruvian government in 1972, and the second one—contained within the first one—is the World Heritage Site established by UNESCO in 1988, whose buildings are marked with the organisation's black-and-white shield.