| Louis Eugen | |
| Succession: | Duke of Württemberg |
| Reign: | 24 October 1793 – 20 May 1795 |
| Predecessor: | Karl Eugen |
| Successor: | Frederick II Eugen |
| Spouse: | Sophie Albertine of Beichlingen |
| Issue: | Sophie Antoinette Wilhelmine Henriette |
| House: | House of Württemberg |
| Father: | Karl Alexander, Duke of Württemberg |
| Mother: | Maria Augusta of Thurn and Taxis |
| Birth Date: | 6 January 1731 |
| Birth Place: | Frankfurt am Main |
| Death Place: | Ludwigsburg |
| Burial Place: | Ludwigsburg Palace |
Ludwig Eugen, Duke of Württemberg (6 January 1731 – 20 May 1795), was the reigning Duke of Württemberg from 1793 until his death in 1795.
He was born as the third son of Duke Karl Alexander and his wife, Princess Maria Augusta of Thurn and Taxis (11 August 1706 – 1 February 1756).
His maternal grandparents were Anselm Franz, 2nd Prince of Thurn and Taxis (30 January 1681 – 8 November 1739) and Princess Maria Ludovika Anna von Lobkowicz (20 October 1683 – 20 January 1750). Maria Ludovika was daughter of Prince Ferdinand August Leopold von Lobkowicz-Sagan (1655–1715) and Princess Maria Anna Wilhelmine of Baden-Baden (1655-1702).
Maria Anna was a daughter of William, Margrave of Baden-Baden (1593–1677) and Countess Maria Magdalena of Oettingen-Baldern (1619-1688). Her paternal grandparents were Edward Fortunatus, Margrave of Baden-Rodemachern (1565–1600) and Baroness Maria of Eicken (1569-1636).
Edward was a son of Christopher II, Margrave of Baden-Rodemachern (1537–1575) and Princess Cecilia of Sweden (1540–1627). Cecilia was a daughter of Gustav I of Sweden (1496–1560) and Margaret Leijonhufvud (1516–1551).
He married (initially morganatically) Countess Sophie Albertine von Beichlingen (15 December 1728 – 10 May 1807), a daughter of August Gottfried Dietrich, Count of Beichlingen (1703–1769) and his wife, Sophie Helene, Baroness of Stöcken (1710–1738). Louis and Sophie had three daughters:
He succeeded his brother Karl Eugen as Duke of Württemberg in 1793, and reigned until his own death in 1795, when he was succeeded by his younger brother Frederick Eugen.