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, Opole Voivodeship|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).

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