| Jurisdiction: | Diocese |
| Banjarmasin | |
| Latin: | Dioecesis Bangiarmasina |
| Local: | Keuskupan Banjarmasin |
| Country: |  Indonesia |
| Rite: | Latin Rite |
| Cathedral: | Holy Family Cathedral, Banjarmasin |
| Parishes: | 9 |
| Area Km2: | 37,530 |
| Population: | 3,680,000 |
| Population As Of: | 2012 |
| Catholics: | 17,051 |
| Catholics Percent: | 0.5 |
| Metro Archbishop: | Yustinus Harjosusanto MSF |
| Emeritus Bishops: | Petrus Boddeng Timang |
| Website: | Blog of the Diocese |
The Roman Catholic Diocese of Banjarmasin (Latin: Bangiarmasin(a)) is a diocese located in the city of Banjarmasin in the ecclesiastical province of Samarinda in Indonesia.