Karl Friedrich Eichhorn (20 November 1781 – 4 July 1854) was a German jurist. Eichhorn was born in Jena as the son of Johann Gottfried Eichhorn. He entered the University of Göttingen in 1797. In 1805 he obtained the professorship of law at Frankfurt (Oder), holding it till 1811, when he accepted the same chair at the new Friedrich Wilhelm University in Berlin. On the call to arms in 1813 he became a captain of horse, and received the Iron Cross at the end of the war.