The Diocese of Groningen-Leeuwarden (Dutch: Bisdom Groningen-Leeuwarden; Latin: Dioecesis Groningensis-Leovardiensis) is a diocese of the Catholic Church in the northern Netherlands. It encompasses the provinces of Groningen Friesland and Drenthe as well as the Noordoostpolder a part of the province of Flevoland.The diocese was erected on 2 February 1956 as the Diocese of Groningen.