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.

John VI of Nassau-Dillenburg was a Count of Nassau in Dillenburg.

John VI was born in Dillenburg, the second son of Count William I of Nassau-Dillenburg and his second wife Juliane of Stolberg-Wernigerode and brother of William I of Orange.

March 1537 – 6 July 1579), who bore him 13 children: Secondly, he married on 13 September 1580 with Kunigunde Jakobäa of Simmern (9 October 1556 – 26 January 1586), daughter of Frederick III, Elector Palatine, who bore him 4 children: Thirdly, he married on 14 June 1586 to Johannetta of Sayn-Wittgenstein (15 February 1561 – 13 April 1622), who bore him 7 children: He died in his native city of Dillenburg, aged 69.