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.

This article about a Roman Catholic diocese in Poland is a stub.