| Jurisdiction: | Diocese |
| San Miguel in Argentina | |
| Latin: | Dioecesis Sancti Michaëlis in Argentina |
| Local: | Diócesis de San Miguel |
| Country: | Argentina |
| Metropolitan: | Buenos Aires |
| Province: | Buenos Aires |
| Area Km2: | 206 |
| Population: | 986,000 |
| Population As Of: | 2010 |
| Catholics: | 852,000 |
| Catholics Percent: | 86.4 |
| Parishes: | 27 |
| Denomination: | Roman Catholic |
| Rite: | Roman Rite |
| Established: | 11 July 1978 (years ago) |
| Cathedral: | Cathedral of St Michael the Archangel in San Miguel |
| Patron: | St Michael the Archangel Our Lady of Luján |
| Bishop Title: | Bishop |
| Bishop: | Damián Nannini |
| Metro Archbishop: | Mario Aurelio Poli |
| Website: | Website of the Diocese |
The Roman Catholic Diocese of San Miguel is a suffragan diocese of the Buenos Aires. It was established by Pope Paul VI on 11 July 1978.