| Jurisdiction: | Diocese |
| Ruy Barbosa | |
| Latin: | Dioecesis Ruibarbosensis |
| Local: | Diocese de Barra |
| Country: | Brazil |
| Metropolitan: | Feira de Santana |
| Rite: | Latin Rite |
| Established: | 14 November 1959 (years ago) |
| Cathedral: | Cathedral of St Anthony in Rui Barbosa |
| Area Km2: | 25,169 |
| Population: | 445,000 |
| Population As Of: | 2010 |
| Catholics: | 357,000 |
| Catholics Percent: | 80.2 |
| Bishop: | Estevam dos Santos Silva Filho |
| Metro Archbishop: | Zanoni Demettino Castro |
The Roman Catholic Diocese of Ruy Barbosa (Latin: Dioecesis Ruibarbosensis) is a diocese located in the city of Ruy Barbosa, Bahia in the ecclesiastical province of Feira de Santana in Brazil.