| Jurisdiction: | Diocese |
| Koszalin-Kołobrzeg | |
| Latin: | Dioecesis Coslinensis-Colubregana |
| Local: | Diecezja Koszalińsko-Kołobrzeska |
| Country: |  Poland |
| Province: | Szczecin-Kamień |
| Established: | 28 June 1972 |
| Denomination: | Catholic Church |
| Sui Iuris Church: | Latin Church |
| Rite: | Roman Rite |
| Cathedral: | Katedra pw. Niepokalanego Poczęcia Najświętszej Maryi Panny in Koszalin |
| Cocathedral: | Bazylika Konkatedralna Wniebowzięcia Najświętszej Maryi Panny in Kołobrzegu |
| Area Km2: | 14,640 |
| Population: | 901,120 |
| Population As Of: | 2019 |
| Catholics: | 811,430 |
| Catholics Percent: | 90 |
| Emeritus Bishops: | Paweł Cieślik Edward Dajczak |
| Auxiliary Bishops: | Krzysztof Zadarko |
| Website: | koszalin.opoka.org |
The Diocese of Koszalin-Kołobrzeg (Latin: Dioecesis Coslinensis-Colubregana) is a Latin Church ecclesiastical jurisdiction of diocese of the Catholic Church in northwestern Poland. The diocese is a suffragan in the ecclesiastical province of the metropolitan Archdiocese of Szczecin-Kamień. The Diocese of Koszalin-Kołobrzeg's cathedral is the Katedra Niepokalanego Poczęcia NMP, in Koszalin. There is also a co-cathedral, the minor basilica Bazylika Konkatedralna Wniebowzięcia NMP, in Kołobrzeg, both in Zachodniopomorskie.[1]
, it pastorally served 822,058 Catholics (90.0% of 912,929 total) on 14,640 km² in 220 parishes with 574 priests (439 diocesan, 135 religious), 367 lay religious (142 brothers, 225 sisters) and 53 seminarians.[1] According to the Polish Institute of the Catholic Church Statistics, weekly mass attendance was 25% in 2013 making the diocese the second least devoutly religious one in Poland after the Archdiocese of Szczecin-Kamień.
In 1000 the Diocese of Kołobrzeg was established in Kołobrzeg by Polish ruler Bolesław I the Brave, along with the dioceses of Wrocław and Kraków and the Archdiocese of Gniezno, as one of the oldest Polish dioceses (the only older diocese being the diocese of Poznań, established in 968).
In 1015 it was however suppressed, its territory being reassigned partly to the Metropolitan Archdiocese of Gniezno (from 1145 however signed over to the exempt Diocese of Kammin, and partly to establish the Diocese of Kujawy–Pomorze (which would merge into aforementioned Gniezno). Only one residential bishop of Kołobrzeg is recorded: Reinbern (1000 – 1007), died 1013.