The São Paulo Metro (Portuguese: Metropolitano de São Paulo, commonly called Metrô) is the principal rapid-transit system in the city of São Paulo and the largest in Brazil. It is also the second largest system in South America and the third largest in Latin America, behind Mexico City and Santiago.

The Companhia do Metropolitano de São Paulo - Metro was founded on 24 April 1968. Eight months later, work on North-South line was initiated. In 1972, the first train trip occurred between Jabaquara and Saúde stations. In 1974, the segment between Jabaquara and Vila Mariana entered into commercial operation.

Today, São Paulo Metro is considered the best rail transportation system in the Americas. The Metro has a length of 74.3 kilometres (46.2 mi), distributed into five lines with 64 stations.

The system is interlinked with CPTM (São Paulo Metropolitan Trains Company) at Brás, Palmeiras-Barra Funda, Tatuapé, Corinthians-Itaquera, Tamanduateí and Santo Amaro stations, and at other modal transportation terminals in the city of São Paulo.