Line 1 (Blue) (Portuguese: Linha 1–Azul) is one of the six lines that make up the São Paulo Metro and one of the thirteen lines that make up the Metropolitan Rail Transportation Network. It was the first line built for the São Paulo Metro and also the first metro line built in Brazil. It links Tucuruvi Station to Jabaquara Station. Construction began in the late 1960s and was completed in the early 1970s.

The São Paulo Metro, commonly called the Metrô, is a rapid transit system that forms part of the urban railways that serves the city of São Paulo, alongside the São Paulo Metropolitan Trains Company (CPTM), both forming the largest metropolitan rail transport network of Latin America. The six lines in the metro system operate on 104.4 kilometres (64.9 mi) of route, serving 89 stations. The metro system carries about 4,300,000 passengers a day.