Prince Frederick Henry[note 1] of Nassau-Siegen (11 November 1651 – 4 September 1676), German: Friedrich Heinrich Prinz von Nassau-Siegen, official titles: Prinz von Nassau, Graf zu Katzenelnbogen, Vianden, Diez, Limburg und Bronkhorst, Herr zu Beilstein, Stirum, Wisch, Borculo, Lichtenvoorde und Wildenborch, Erbbannerherr des Herzogtums Geldern und der Grafschaft Zutphen), was a count from the House of Nassau-Siegen, a cadet branch of the Ottonian Line of the House of Nassau.

Frederick Henry was born at Wisch Castle [nl] in Terborg on 11 November 1651[1][2][note 2] as the second son of Count Henry of Nassau-Siegen and Countess Mary Magdalene of Limburg-Stirum.

[8] On 7 January 1664, the two brothers were inaugurated in the town hall of Siegen, where they confirmed the city privileges and liberties.

[10][11] In 1667 Frederick Henry became a knight of the Order of Saint John (Bailiwick of Brandenburg) in Sonnenburg.

[1] On 18 December 1670 he was appointed ritmeester in the Dutch States Army, on 22 June 1674 he became colonel of the infantry.