Regierungsbezirk Marienwerder was a
Regierungsbezirk (governorate), or administrative region, of
Prussia from 1815 until 1945. Marienwerder region was part of the Province of
West Prussia from 1815–1829, and again 1878–1920, belonging to the
Province of Prussia in the intermittent years. Marienwerder region was then placed under an inter-allied commission from 1920–22. It was known as
Regierungsbezirk Westpreußen ("West Prussia") while it was joined to the
Province of East Prussia from 1922–39, after which its original name was restored until its dissolution in 1945. The regional capital was
Marienwerder (Kwidzyn).