The Düsseldorf Cow War (German: Düsseldorfer Kuhkrieg) was a military conflict over the status of church property in the duchies Jülich and Berg. It lasted between June and December 1651, pitting the Catholic Palatinate-Neuburg against the Protestant Margraviate of Brandenburg. It ended in peaceful settlement, confirming the distribution of church property on the basis of the year 1651.