The Lordship of Myllendonk (sometimes spelled "Millendonk") was an estate of the Holy Roman Empire, located in western North Rhine-Westphalia, Germany. It was bordered by the Duchy of Jülich to the west and north, the to the south, and the Archbishopric of Cologne to the east and southeast. The lordship contained Grevenbroich and the Castle of . From 1700, Myllendonk was an Imperial Estate with a vote in the Bench of Counts of Westphalia.