Count John VI of Nassau-Dillenburg (22 November 1536 – 8 October 1606) was the second son of William the Rich and the younger brother of William the Silent. He has a special place in the history of the Netherlands because he is the male-line forefather of the House of Orange which ruled that country until 1948. John VI of Nassau-Dillenburg was a Count of Nassau in Dillenburg. Other names he had were Jan VI or Jan de Oude ("John the Elder", to distinguish him from his 2nd son, "John the Middle", and his grandson "John the Younger").