| Jurisdiction: | Diocese |
| Zamość-Lubaczów | |
| Latin: | Dioecesis Zamosciensis-Lubaczoviensis |
| Local: | Diecezja Zamojsko-Lubaczowska |
| Province: | Przemyśl |
| Country: | Poland |
| Metropolitan: | Archdiocese of Przemyśl |
| Established: | 3 June 1991 |
| Rite: | Latin Rite |
| Cathedral: | Katedra Zmartwychwstania Pańskiego i św. Tomasza Apostoła, Zamość (Cathedral of the Resurrection and St. Thomas the Apostle) |
| Cocathedral: | Konkatedra św. Stanisława, Lubaczów (Co-Cathedral Shrine of St. Stanislaus) |
| Area Km2: | 8,144 |
| Population: | 471,000 |
| Population As Of: | 2020 |
| Catholics: | 457,000 |
| Catholics Percent: | 97 |
| Metro Archbishop: | Adam Szal |
| Auxiliary Bishops: | Mariusz Leszczyński |
| Emeritus Bishops: | Jan Śrutwa |
| Website: | Website of the Diocese |
| Denomination: | Catholic Church |
The Diocese of Zamość-Lubaczów (Latin: Dioecesis Zamosciensis-Lubaczoviensis) is a suffragan Latin diocese of the Catholic Church in the ecclesiastical province of Przemyśl in Poland.
Its cathedral episcopal see is Katedra Zmartwychwstania Pańskiego i św. Tomasza Apostoła, a World Heritage Site dedicated to Resurrection and the St. Thomas the Apostle, in the city of Zamość, Lubelskie. It also has
As per 2014, it pastorally served 462,586 Catholics (94.9% of 487,500 total) on 8,144 km² in 185 parishes and 4 missions with 478 priests (451 diocesan, 27 religious), 173 lay religious (27 brothers, 146 sisters) and 45 seminarians.
(all Roman rite)