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

• a Co-cathedral: Konkatedra św. Stanisława, dedicated to Saint Stanislaus, in Lubaczów, Podkarpackie
• a Minor Basilica: Bazylika św. Antoniego z Padwy, in Radecznica, Lubelskie
• a second World Heritage Site: Cerkiew św. Paraskewy, in Radruż, Podkarpackie.

• 1991: Established as Apostolic Administration of Lubaczów, on territory split off from the Metropolitan Archdiocese of Lviv (in Ukraine)
• Promoted on 25 March 1992 as Diocese of Zamość – Lubaczów, having gained territory from the Diocese of Lublin
• Enjoyed Papal visits from the Polish Pope John Paul II in June 1991 and June 1999.

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)

Suffragan Bishops of Zamość-Lubaczów

• Jan Śrutwa (25 March 1992 – retired 5 August 2006); previously Titular Bishop of Liberalia (1984.07.25 – 1992.03.25) as Auxiliary Bishop of Diocese of Lublin (Poland) (1984.07.25 – 1992.03.25)
• Wacław Depo (5 August 2006 – 29 December 2011), next Metropolitan Archbishop of Częstochowa (Poland) (2011.12.29 – ...)
• Marian Rojek (30 June 2012 – ... ), previously Titular Bishop of Tisedi (2005.12.21 – 2012.06.30) as Auxiliary Bishop of Archdiocese of Przemyśl (Poland) (2005.12.21 – 2012.06.30).

• List of Catholic dioceses in Poland
• Roman Catholicism in Poland

• GCatholic.org - data for all sections
• Catholic Hierarchy
• Diocese website

50°42′59″N 23°15′01″E / 50.716518°N 23.250406°E / 50.716518; 23.250406