Vistula delta Mennonites were a historic Mennonite community, established in the mid-16th century in the Vistula river delta in Poland. It originated from the Netherlands and present-day northern Germany. The Mennonite community played an important role in the drainage and cultivation of the Vistula delta and the trade relations with the Netherlands. In the late 18th century a significant number of Mennonites emigrated further and formed the nucleus of the Mennonite settlements in Russia, while many remained in the region after the annexation of the region by Prussia in the Partitions of Poland. With the end of World War II and the flight and expulsion of Germans (including Germanized Dutch settlers) the Mennonite settlements in the Vistula delta ceased to exist.