Line 12

Line 12 may refer to several railway routes:

Asia

 * Line 12 (Beijing Subway), China (under construction)
 * Line 12 (Dalian Metro), China
 * Line 12 (Guangzhou Metro), China (under construction)
 * Line 12 (Shanghai Metro), China
 * Line 12 (Shenzhen Metro), China
 * Line 12 (Mumbai Metro), India
 * Downtown MRT line, numbered 12, Singapore
 * Putrajaya line, or Line 12, Malaysia
 * Toei Ōedo Line, originally Line 12, Tokyo, Japan

Europe

 * Line 12 (Barcelona Metro), a shuttle train on the Barcelona–Vallès Line, Spain
 * Line 12 (Madrid Metro), Spain
 * Line 12 (Moscow Metro), Russia
 * Paris Métro Line 12, France
 * S12 (ZVV), Zurich, Switzerland

North America

 * 12 (BMT rapid transit service), New York City, US (defunct)
 * Mexico City Metro Line 12, Mexico

South America

 * Line 12 (CPTM), São Paulo, Brazil