Line 15 (Silver) (Portuguese: Linha 15–Prata) 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 is South America's first mass-transit monorail and is the first system in the world to use the Bombardier Innovia Monorail 300. When completed it will be the largest and highest capacity monorail system in the Americas and second worldwide only to the Chongqing Monorail. The first section, from Vila Prudente to Oratório, opened on 30 August 2014, initially running 10 AM–3 PM on weekends only. As of 26 October 2016, the line is operational from 4:40 AM–12 AM. The line has a free connection to Line 2-Green on Vila Prudente station and future connection to CPTM Line 10-Turquoise on Ipiranga station.

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.