| Jurisdiction: | Diocese |
| Ciudad Lázaro Cárdenas | |
| Latin: | Dioecesis Civitatis Lazari Cárdenas |
| Local: | Diócesis de Ciudad Lázaro Cárdenas |
| Country: | Mexico |
| Province: | Morelia |
| Area Sqmi: | 5,747 |
| Population: | 805,000 |
| Population As Of: | 2006 |
| Catholics: | 725,000 |
| Catholics Percent: | 90.1 |
| Parishes: | 23 |
| Denomination: | Catholic Church |
| Sui Iuris Church: | Latin Church |
| Rite: | Roman Rite |
| Established: | 11 October 1985 (years ago) |
| Cathedral: | Cathedral of Christ the King |
| Bishop: | Armando António Ortíz Aguirre |
| Metro Archbishop: | Carlos Garfias Merlos |
| Emeritus Bishops: | José de Jesús Sahagún de la Parra |
| Map: | Roman Catholic Diocese of Ciudad Lázaro Cárdenas in Mexico.jpg |
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. It was a suffragan of the Archdiocese of Acapulco until 25 November 2006.