Roman Catholic Diocese of Srijem
Diocese of Srijem Dioecesis Sirmiensis Сремска бискупија Sremska biskupija  | |
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| Location | |
| Country | Serbia | 
| Ecclesiastical province | Đakovo-Osijek | 
| Metropolitan | Archdiocese of Đakovo-Osijek | 
| Statistics | |
| Area | 3,766 km2 (1,454 sq mi) | 
Population
 
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| Information | |
| Denomination | Catholic Church | 
| Sui iuris church | Latin Church | 
| Rite | Roman Rite | 
| Established | 1229 | 
| Cathedral | Cathedral Basilica of St. Demetrius | 
| Current leadership | |
| Pope | Leo XIV | 
| Bishop | Fabijan Svalina | 
| Metropolitan Archbishop | Đuro Hranić | 
| Bishops emeritus | Đuro Gašparović | 
| Map | |
Map of organization of Roman Catholic Church in Serbia   Syrmia Bishopric – Grey  | |
The Diocese of Srijem (Latin: Dioecesis Sirmiensis) is Latin Church ecclesiastical territory or diocese of the Catholic Church in Serbia. It is a suffragan diocese in the ecclesiastical province of the Archdiocese of Đakovo-Osijek. The episcopal see of the diocese is in Sremska Mitrovica.