Mexico City Metro Line B is one of the twelve metro lines operating in Mexico City, Mexico. It has 21 stations and a total length of 23.772 km (14.771 mi), 20.278 km (12.600 mi) service the line while the rest are used for maneuvers.

Line 5, also known as the Yellow Line from its color on the system map, is a rapid transit line of the Mexico City Metro network. It travels 15.6 kilometers (9.7 mi) along the boroughs of Gustavo A. Madero, Cuauhtémoc and Venustiano Carranza in northern, northeastern and eastern Mexico City, serving thirteen stations. The line was inaugurated on 19 December 1981, going from Pantitlán to Consulado station. In 1982, the line was expanded twice, first from Consulado to La Raza station on 1 July, and later from La Raza to Politécnico station on 30 August.