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 Lordship of Dyck to the south, and the Archbishopric of Cologne to the east and southeast. The lordship contained Grevenbroich and the Castle of Myllendonk.