| Jurisdiction: | Diocese |
| Port Blair | |
| Latin: | Dioecesis Portus Blairensis |
| Rite: | Latin Rite |
| Cathedral: | Stella Maris Cathedral in Port Blair |
| Area Km2: | 8,249 |
| Population: | 471,430 |
| Population As Of: | 2017 |
| Catholics: | 39,935 |
| Catholics Percent: | 8.5 |
| Bishop: | Visuvasam Selvaraj |
| Bishop Title: | Bishop elect |
| Metro Archbishop: | Felix Toppo |
| Website: | Website of the Diocese |
The Roman Catholic Diocese of Port Blair (Latin: Portus Blairen(sis)) is a diocese located in the city of Port Blair in the ecclesiastical province of Ranchi in India.