The Abbey Church (Danish: Klosterkirken), also known as Nykøbing Church, in Nykøbing on the Danish island of Falster is a church in the Gothic style from the 15th century. Its origins go back to 1419 when Eric of Pomerania, king of the Nordic Kalmar Union, established a Franciscan monastery. One of its treasures is the Mecklenburg Ancestral Table (1627) presenting the ancestors of the dowager Queen Sophie.
The first historical reference is to St Nicholas Chapel where Eric of Pomerania founded a Greyfriars monastery in honour of Our Lady, St Michael and St Francis. The church must have been completed by 1482 when the annual Franciscan chapter meeting was held in Nykøbing to celebrate the 300th anniversary of the birth of Francis of Assisi with representatives of Franciscan communities in the Nordic countries. In 1532, when the monks had left the abbey, the church was transferred to the citizens of Nykøbing as the parish church. In the 16th and 17th centuries, the church had close connections with Nykøbing Castle (now demolished) which became the residence of Denmark's dowager queens.
The church lies close to the southern limit of the town as, in the Middle Ages, it was on relatively high ground. It formed the south wing of the Franciscan abbey's four wings of which, in addition to the church, only the significantly reworked west wing remains. Private houses grew up around the church until they were cleared after a workshop fire around 1900.