Joachim Friedrich Hohenzollern Kurfürst (elector) of Brandenburg (1546-1608) succeeded his father Johann Georg as margrave of Brandenburg in 1598, and was in turn succeeded at his death by his son Johann Sigismund. His mother was Sophie Princess of Liegnitz. He was duke of Prussia on account of his grandfather Joachim II Hector and his father Johann Georg having been co-inheritors of the Dukedom of Prussia.

Joachim Friedrich's sister was Sophie, who married Christian Wettin, Duke of Saxony. From that line came the later Frederick August I (the Strong) Duke of Saxony and King of Poland .

His first marriage in 1570 was to Catherine Prinzessin von Brandenburg-Küstrin, daughter of Johann I Markgraf von Brandenburg-Küstrin and Katherine Herzogin von Braunschweig-Wolfenbüttel.

Joachim Friedrich's second marriage, in 1603, was to Eleonore Hohenzollern, born 1583, daughter of Albert Frederick, Duke of Prussia and Marie Eleonore von Kleve.

Children of Joachim Friedrich and Catherine Princess of Brandenburg-Küstrin:

• Johann Sigismund Kurfürst of Brandenburg b. 1572, d. 1619
• Anne Katherine von Hohenzollern b. 26 Jun 1575, d. 29 Mar 1612
• Johann Georg Herzog von Jägerndorf b. 1577, d. 1624
• August von Hohenzollern b. 1580, d. 1601
• Albrecht Friedrich von Hohenzollern b. 1582, d. 1600
• Joachim von Hohenzollern b. 1583, d. 1600
• Ernst von Hohenzollern b. 1583, d. 1613
• Barbara Sophie von Hohenzollern b. 1584, d. 1636
• Christian Wilhelm, margrave of Brandenburg b. 7 Sep 1587, d. 11 Jan 1665

Child of Joachim Friedrich Kurfürst von Brandenburg and Eleonore von Hohenzollern: Marie Eleonore von Hohenzollern b. 22 Mar 1607