William Louis, Count of Nassau-Dillenburg, Dutch count (d. 1620)
William Louis of Nassau-Dillenburg (Dutch: Willem Lodewijk; West Frisian: Willem Loadewyk; 13 March 1560, Dillenburg, Hesse – 13 July 1620, Leeuwarden, Netherlands) was Count of Nassau-Dillenburg from 1606 to 1620, and stadtholder of Friesland, Groningen, and Drenthe.