| Duke Eugen | |
| Full Name: | German: Eugen Friedrich Heinrich |
| House: | Württemberg |
| Father: | Frederick II Eugene, Duke of Württemberg |
| Mother: | Margravine Sophia Dorothea of Brandenburg-Schwedt |
| Birth Date: | 21 November 1758 |
| Birth Place: | Schwedt, Margraviate of Brandenburg |
| Death Place: | Meiningen, Saxe-Meiningen |
Duke Eugen of Württemberg (German: Herzog Eugen Friedrich Heinrich von Württemberg; 21 November 1758 - 20 June 1822) was a German prince. He was the brother of Frederick I of Württemberg.
Duke Eugen was born at Schwedt, Margraviate of Brandenburg, the third child of Frederick II Eugene, Duke of Württemberg (1732–1797), (son of Charles Alexander, Duke of Württemberg, and Princess Maria Augusta of Thurn and Taxis) and his wife, Margravine Sophia Dorothea of Brandenburg-Schwedt (1736–1798), (daughter of Frederick William, Margrave of Brandenburg-Schwedt and Princess Sophia Dorothea of Prussia).
Eugen was educated by Johann Georg Schlosser, a brother of Johann Wolfgang von Goethe. The prince entered the Army of the Kingdom of Prussia. His regiment the Oleśnica Silesian Hussars being stationed, at that time, near the residence of Eugen's relatives, part of the Duchy of Oels. Whose last Duke Charles Christian Erdmann, left Eugen, in his will, and by fee-tail, the estate of Pokój, Carlsruhe Palace.
From 1795 Eugen was governor of the fortress of Glogau. In the War of the Fourth Coalition, at the Battle of Jena-Auerstedt he commanded the Reserve cavalry of the Prussian Army. On 18 October 1806 he fought at the Battle of Halle where he was defeated by Marshal Jean Bernadotte (later became King Charles XIV John of Sweden).
Carlsruhe became the permanent residence of Duke Eugen, which he endowed with a theater and chapel. The Duke was a great patron of the composer Carl Maria von Weber, who became his secretary and in September 1806 he was designated as Kapellmeister at Carlsruhe. Eugen's son, distinguished himself in the War of the Sixth Coalition which led to the theater being closed, and Carl Maria von Weber dismissed. In 1820 Eugen built the Cavalier Homes on the Schlossplatz in Carlsruhe.
From 1820 until his death Eugen was a member of the First Chamber of the Estates of Württemberg though he never appeared in person to the meetings, being represented by Count Charles of Reischach.
On 21 January 1787, in Meiningen, he married Princess Louise of Stolberg-Gedern, daughter of Prince Christian Karl of Stolberg-Gedern and Countess Eleonore Reuss of Lobenstein. Louise was the widow of Charles William, Duke of Saxe-Meiningen. They had five children: