Westpreußisches Landesmuseum, Country museum in Warendorf, Germany

The Westpreussisches Landesmuseum is a regional museum in Warendorf that displays collections of documents and objects related to West Prussian history. It offers permanent exhibitions and temporary displays covering life, culture, and the development of this region.

The museum opened on 6 July 1975 as the Documentation and Cultural Centre for West Prussia in the Drostenhof in Münster-Wolbeck, the first permanent exhibition on West Prussia in western Germany. By the 1990s the building needed major modernisation, and no agreement on the works was reached. It closed in Münster at the end of August 2012 and reopened in December 2014 in the former Franciscan monastery in Warendorf.

The permanent exhibition covers the history, art and culture of West Prussia, a region on the lower Vistula. The museum works in partnership with Polish institutions, and since 1990 a foundation has supported the restoration of Krockow Castle in Pomerania, where a branch exhibition is housed.

The museum occupies the former Franciscan monastery in Warendorf, where it reopened in December 2014 after leaving Münster. The permanent exhibition on West Prussia's history, art and culture is supplemented by temporary shows, a reference library, the West Prussia Archive and a photo archive. A branch is housed in the 1784 Krockow castle in Krokowa, Pomeranian Voivodeship, Poland.

The museum runs a branch in Krokowa (Krockow) in Poland's Pomeranian Voivodeship, housed alongside a hotel in the castle of the Krockow family, built in 1784. A foundation created in 1990 funded the castle's restoration. The branch opened well after the museum's founding, not in 1999.