Duke Eugen of Württemberg (German: Herzog Eugen Wilhelm Alexander Erdmann von Württemberg; 25 December 1820 – 8 January 1875) was a German prince.

Duke Eugen was born at Carlsruhe, currently Pokój, Opole Voivodeship, Kingdom of Prussia, second child and first son of Duke Eugen of Württemberg (1788–1857), (son of Duke Eugen of Württemberg, and Princess Louise of Stolberg-Gedern) and his wife, Princess Mathilde of Waldeck and Pyrmont (1801–1825), (daughter of George I, Prince of Waldeck and Pyrmont and Princess Augusta of Schwarzburg-Sondershausen).

Eugen was Commander of the 1st Westphalian Hussars No.

At the time of his death he was second in the line to the throne of Württemberg after Prince William (later King William II).

On 15 July 1843, in Bückeburg, he married Princess Mathilde of Schaumburg-Lippe (1818–1891), daughter of George William, Prince of Schaumburg-Lippe and Princess Ida of Waldeck and Pyrmont.