| Jurisdiction: | Diocese |
| Njombe | |
| Latin: | Dioecesis Niombena |
| Country: | Tanzania |
| Metropolitan: | Songea |
| Rite: | Latin Rite |
| Area Km2: | 20,860 |
| Population: | 659,506 |
| Population As Of: | 2004 |
| Catholics: | 258,446 |
| Catholics Percent: | 39.2 |
| Bishop: | Eusebio Samwel Kyando |
| Apostolic Admin: | John Chrisostom Ndimbo |
The Roman Catholic Diocese of Njombe (Latin: Dioecesis Niombena) is a diocese located in Njombe in the ecclesiastical province of Songea in Tanzania.