Charles Emmanuel, Landgrave of Hesse-Rotenburg

Charles Emmanuel, Landgrave of Hesse-Rotenburg (Karl Emanuel; 5 June 1746 – 23 March 1812) was landgrave of Hessen-Rotenburg between 1778 and 1812. He was named after his uncle Charles Emmanuel III of Sardinia, husband of his aunt Polyxena of Hesse-Rotenburg.

He was born in Langenschwalbach, the son of Constantine, Landgrave of Hesse-Rotenburg (24 May 1716 – 30 December 1778) and his first wife, Countess Maria Sophia Theresia Hedwigis Eva von Starhemberg (October 1722 – 12 December 1773), widow of William Hyacinth, Prince of Nassau-Siegen and sister of Georg Adam, Prince of Starhemberg.

Karl Emanuel married Princess Leopoldina Maria Anna Francisca de Paula Adelgunda of Liechtenstein (Vienna, 30 January 1754 – Frankfurt, 16 October 1823), daughter of Franz Josef I, Prince of Liechtenstein, on 1 September 1771 in Felsberg. The couple had two children.

• Victor Amadeus (2 September 1779 – 12 November 1834); named after Victor Amadeus III of Sardinia
• Marie Adelheid Klotilde (12 September 1787 – 6 January 1869); named after Clothilde of France; married Prince Karl August of Hohenlohe-Bartenstein (1788–1844)

Karl also had an illegitimate son by Lucie Juliane Amalie Struve (b. 1769), daughter of Johann Conrad Struve (d. 1782), Quartermaster from Braunschweig:

• Ernst von Blumenstein (11 February 1796 – 25 August 1875); married Johanna Caroline Friederike von Meyerfeld (1799-1866) and had issue

Karl's only descendants were from his illegitimate line.

He died in Frankfurt in 1812.