| Jurisdiction: | Diocese |
| Jelgava | |
| Latin: | Dioecesis Ielgavensis |
| Local: | Diecēze Jelgavas |
| Country: |  Latvia |
| Metropolitan: | Riga |
| Rite: | Latin Rite |
| Sui Iuris Church: | Latin Church |
| Cathedral: | Bezvainīgās Jaunavas Marijas katedrāle (Cathedral of Our Lady) |
| Area Km2: | 13,620 |
| Population: | 211,707 |
| Population As Of: | 2016 |
| Catholics: | 77,880 |
| Catholics Percent: | 36.8 |
| Parishes: | 59 |
| Bishop: | Edvards Pavlovskis |
| Metro Archbishop: | Zbigņevs Stankevičs |
| Map: | Lettonia_-_Diocesi_di_Jelgava.png |
The Roman Catholic Diocese of Jelgava (Latin: Ielgaven(sis)) is a diocese located in the city of Jelgava in the ecclesiastical province of Riga in Latvia.