Count Eitel Friedrich IV of Hohenzollern (7 September 1545 in Sigmaringen – 16 January 1605 in Hechingen) was the founder and first Count of the line Hohenzollern-Hechingen as Eitel Friedrich I. Eitel Friedrich was the eldest surviving son of Count Karl I of Hohenzollern (1516–1576) from his marriage to Princess Anna of Baden-Durlach (1512–1579), daughter of the Margrave Ernst of Baden-Durlach.

Hohenzollern-Hechingen included the original County of Zollern, with the town of Hechingen and monasteries at Rangendingen, St. Luzen and Stetten.

In Hechingen, he built a Renaissance style residence, named the Friedrichsburg, from which the New Castle later evolved.

[2] He initiated other construction projects as well, including the St. Lucerne abbey church, the hospital and the lower tower.

On 1 March 1601 he was married for the third time, to Countess Johanna of Eberstein (1570–1633), the daughter of Count Otto of Eberstein-Boldrungen (1533–1576) and his wife, Baroness Felicitas Colonna von Völs (b.