| Jurisdiction: | Diocese |
| Barreiras | |
| Latin: | Dioecesis Barreriensis |
| Local: | Diocese de Barreiras |
| Country: |  Brazil |
| Rite: | Latin Rite |
| Established: | 21 May 1979 (years ago) |
| Cathedral: | Cathedral of St John the Baptist in Barreiras |
| Area Km2: | 72,675 |
| Population: | 355,000 |
| Population As Of: | 2012 |
| Catholics: | 320,000 |
| Catholics Percent: | 90.1 |
| Bishop: | (vacant) |
| Metro Archbishop: | Zanoni Demettino Castro |
The Roman Catholic Diocese of Barreiras (la|Dioecesis Barreriensis) is a diocese located in the city of Barreiras in the ecclesiastical province of Feira de Santana in Brazil.