| Jurisdiction: | Diocese |
| Masan | |
| Latin: | Dioecesis Masanensis |
| Local: | 마산교구 |
| Country: | South Korea |
| Metropolitan: | Archdiocese of Daegu |
| Territory: | Western part of South Gyeongsang |
| Province: | Daegu |
| Area Km2: | 9,054 |
| Population: | 2,466,654 |
| Population As Of: | 2017 |
| Catholics: | 182,194 |
| Catholics Percent: | 7.2 |
| Parishes: | 73 |
| Denomination: | Catholic Church |
| Sui Iuris Church: | Latin Church |
| Rite: | Roman Rite |
| Established: | February 15, 1966 (years ago) |
| Cathedral: | Cathedral of the Sacred Heart in Masan |
| Bishop: | Sede Vacante |
| Bishop Title: | Bishop |
| Metro Archbishop: | Thaddeus Cho Hwan-gil |
| Emeritus Bishops: | Francis Xavier Ahn Myong-ok Constantine Bae Ki-hyen |
| Map: | Diocese of Masan.svg |
| Website: | Website of the Diocese |
The Diocese of Masan (Latin: Dioecesis Masanensis) is a Latin Church ecclesiastical territory or diocese of the Catholic Church in South Korea. It is a suffragan diocese in the ecclesiastical province of the Archdiocese of Daegu. The current bishop is Constantine Bae Ki Hyen, appointed in 2016.
On February 15, 1966 Pope Paul VI established the Diocese of Masan with territory taken from the Diocese of Busan.[1] [2]
Father Paul Shin Eun-geun, apostolic administrator (2022-)[4] [5]