| Jurisdiction: | Diocese |
| Osasco | |
| Latin: | Dioecesis Osascanensis |
| Rite: | Latin Rite |
| Established: | 15 March 1989 (years ago) |
| Cathedral: | Catedral Santo Antônio |
| Area Km2: | 2,416 |
| Population: | 2,160,175 |
| Population As Of: | 2004 |
| Catholics: | 1,786,420 |
| Catholics Percent: | 82.7 |
| Metro Archbishop: | Odilo Scherer |
| Website: | www.diocesedeosasco.com.br |
The Roman Catholic Diocese of Osasco (Latin: Dioecesis Osascanensis) is a diocese located in the city of Osasco in the ecclesiastical province of São Paulo in Brazil.