| Jurisdiction: | Diocese |
| Tulcán | |
| Latin: | Dioecesis Tulcanensis |
| Country: | Ecuador |
| Province: | Quito |
| Area Km2: | 3,699 |
| Population: | 184,000 |
| Population As Of: | 2010 |
| Catholics: | 176,000 |
| Catholics Percent: | 95.7 |
| Parishes: | 25 |
| Denomination: | Roman Catholic |
| Rite: | Latin Rite |
| Established: | 17 March 1965 |
| Bishop: | Carlos Washington Yépez Naranjo |
| Map: | Ecuador - Diocesi di Tulcán.jpg |
The Roman Catholic Diocese of Tulcán (Latin: Dioecesis Tulcanensis) is a diocese located in the city of Tulcán in the ecclesiastical province of Quito in Ecuador.