Karl Eugen Damian Erwein, Fürst von der Leyen und zu Hohengeroldseck (3 April 1798 – 17 May 1879) was a Baden nobleman, Bavarian landowner and Major General.

He was born on 3 April 1798 at Wiesentheid, the son of Sophia Therese Walpurgis von Schönborn (1772–1810) and Philipp Franz Wilhelm Ignaz Peter von der Leyen (1766–1829), who briefly ruled the Principality of Leyen.

His sister Amalia, was the wife of Count Louis Tascher de La Pagerie (a first cousin of the French Empress Josephine).

[1] His paternal grandparents were Franz Georg Karl Anton von der Leyen und zu Hohengeroldseck and the former Baroness Maria Anna Sophia of Dalberg (sister of Karl Theodor Anton Maria von Dalberg, who later became Prince-Primate of the Confederation of the Rhine).

Together, they were the parents of:[3] The Prince of Leyen died in Waal, Bavaria on 17 May 1879, and was succeeded in his titles by his eldest son, Philipp.