| Jurisdiction: | Diocese |
| Nalgonda | |
| Latin: | Dioecesis Nalgondaensis |
| Country: | India |
| Local: | नलगोंडा के सूबा |
| Rite: | Latin Rite |
| Cathedral: | Mariarani Cathedral (Cathedral of Mary Queen of the Apostles) in Nalgonda |
| Area Km2: | 32,161 |
| Population: | 5,622,168 |
| Population As Of: | 2004 |
| Catholics: | 66,997 |
| Catholics Percent: | 1.2 |
| Metro Archbishop: | Thumma Bala |
The Roman Catholic Diocese of Nalgonda (Latin: Nalgondaen(sis)) is a diocese located in the city of Nalgonda in the ecclesiastical province of Hyderabad in India.