Louis Charles, Duke of Schleswig-Holstein-Sonderburg-Franzhagen

Louis Charles, Duke of Schleswig-Holstein-Sonderburg-Franzhagen (4 June 1684 – 11 October 1707) was a German nobleman. He was the second son of Duke Christian Adolph of Schleswig-Holstein-Sonderburg and his wife, Duchess Eleonora Charlotte of Saxe-Lauenburg.
In 1707, he succeeded his elder brother Leopold Christian as Duke of Schleswig-Holstein-Sonderburg-Franzhagen. However, he died later that year.
He was married to Anna Dorothea of Winterfeld. They had two children together:
Eleonore Charlotte (2 September 1706 – 9 February 1708)
Christian Adolph (16 September 1707 – 26 March 1709)
His son Christian Adolph succeeded as Duke of Schleswig-Holstein-Sonderburg-Franzhagen. With his death in 1709, the Schleswig-Holstein-Sonderburg-Franzhagen line died out.