| Jurisdiction: | Diocese |
| Joliette | |
| Latin: | Dioecesis Ioliettensis |
| Coat: | File:Diocese_of_Joliette.jpg |
| Coat Size: | 200px |
| Coat Caption: | Logo of the Diocese |
| Country: |  Canada |
| Province: | Archdiocese of Montreal |
| Population: | 285,500[1] |
| Catholics: | 257,420 |
| Catholics Percent: | 90.2 |
| Parishes: | 23 |
| Denomination: | Catholic Church |
| Rite: | Roman Rite |
| Established: | 27 January 1904 |
| Cathedral: | St. Charles Borromeo Cathedral, Joliette |
| Priests: | 45 |
| Bishop: | Louis Corriveau |
| Website: | diocesedejoliette.org |
The Roman Catholic Diocese of Joliette (Latin: Dioecesis Ioliettensis) (erected 27 January 1904) is a suffragan in Joliette of the Archdiocese of Montréal.