Line 19

Line 19 may refer to:
 * Line 19 (Beijing Subway), metro line in Beijing, China
 * Line 19 (Chengdu Metro), metro line in Chengdu, China
 * Line 19 (Hangzhou Metro), metro line in Hangzhou, China
 * Line 19 (Shanghai Metro), metro line under planning in Shanghai, China
 * Line 19 (Stockholm Metro), one of the three green lines
 * Line 19 (São Paulo Metro), a metro line that is being planned
 * Line 19 (Wuhan Metro), metro line in Wuhan, China