The Diocese of Ciudad Lázaro Cárdenas (Latin: Dioecesis Civitatis Lazari Cárdenas) is a Latin Church ecclesiastical territory or diocese of the Catholic Church.

It is a suffragan in the ecclesiastical province to the metropolitan Archdiocese of Morelia.

Its cathedra is within the Cathedral of Christ the King, in the episcopal see of Lázaro Cárdenas, Michoacán.

The Diocese of Ciudad Lázaro Cárdenas was erected on 11 October 1985.

This article on a Roman Catholic diocese in Mexico is a stub.