| Jurisdiction: | Diocese |
| Hiroshima | |
| Local: | Japanese: カトリック広島教区 |
| Latin: | Dioecesis Hiroshimaensis |
| Country: |  Japan |
| Territory: | Hiroshima, Okayama, Tottori, Yamaguchi, and Shimane |
| Metropolitan: | Osaka 大阪 |
| Province: | Osaka 大阪 |
| Rite: | Latin Rite |
| Cathedral: | Cathedral of the Assumption of Mary in Hiroshima |
| Area Km2: | 3,180 |
| Population: | 7,677,735 |
| Population As Of: | 2006 |
| Catholics: | 21,496 |
| Catholics Percent: | 0.3 |
| Bishop: | Alexis Mitsuru Shirahama, P.S.S[1] |
| Metro Archbishop: | Thomas Aquino Manyo Maeda[2] |
| Map: | Giappone - Diocesi di Hiroshima.png |
| Website: | Website of the Diocese |
The Diocese of Hiroshima (Latin: Dioecesis Hiroshimaensis, Japanese: カトリック広島教区) is a Latin Church diocese of the Catholic Church located in the city of Hiroshima in the ecclesiastical province of Osaka 大阪 in Japan.