| Jurisdiction: | Diocese |
| Cancún-Chetumal | |
| Latin: | Praelatura Territorialis Cancunensis–Chetumaliensis |
| Local: | Prélature Territoriale de Cancún-Chetumal |
| Country: |  Mexico |
| Metropolitan: | Cancún |
| Province: | Province of Yucatán |
| Area Sqmi: | 19,638 |
| Population: | 1,200,000 |
| Population As Of: | 2004 |
| Catholics: | 950,000 |
| Catholics Percent: | 79.2 |
| Parishes: | 35 |
| Denomination: | Roman Catholic |
| Rite: | Roman Rite |
| Established: | 23 May 1970 (years ago) |
| Cathedral: | Cathedral of the Most Holy Trinity |
| Cocathedral: | Cathedral of the Sacred Heart of Jesus |
| Bishop: | Pedro Pablo Elizondo Cárdenas, L.C. |
| Metro Archbishop: | Gustavo Rodriguez Vega |
| Map: | Mapa prelatura de Cancún-Chetumal.jpg |
The Roman Catholic Diocese of Cancún–Chetumal (Latin: Dioecesis Cancunensis–Chetumaliensis) is a suffragan of the Metropolitan Archdiocese of Yucatán. It was elevated from a Roman Catholic Territorial Prelature on February 15, 2020.
It was erected on 23 May 1970 as the Territorial Prelature of Chetumal, renamed 20 December 1996, as reflected in its double see-name. On 15 February 2020, while keeping the see name, it was raised to diocese.[1]
It has a cathedral see, Catedral de la Santísima Trinidad, in Cancun, and a co-cathedral, Catedral del Sagrado Corazón, in Chetumal, both in Quintana Roo on the Yucatán Peninsula.
All its prelates were members of the Legion of Christ (L.C.)