The Mexibús Line IV (also stylized in Arabic numbers as 4) is a bus rapid transit (BRT) line in the Mexibús system.

It operates between the Universidad Mexiquense del Bicentenario (UMB) in Tecámac, State of Mexico, and La Raza metro station in Gustavo A. Madero, Mexico City.

It was inaugurated by the governor of the State of Mexico, Alfredo del Mazo Maza on 24 February 2021.

[3] The line began construction in June 2014,[4] and was expected to open since 2015.

[7][8] The line is expected to connect with the Felipe Ángeles International Airport, in Zumpango Municipality to the north.