| Duke Nicholas of Württemberg | |
| Spouse: | Duchess Wilhelmine of Württemberg |
| Full Name: | German: Nikolaus |
| House: | House of Württemberg |
| Father: | Duke Eugen of Württemberg |
| Mother: | Princess Helene of Hohenlohe-Langenburg |
| Birth Date: | 1 March 1833 |
| Birth Place: | Carlsruhe, Kingdom of Prussia |
| Death Place: | Bad Carlsruhe, Kingdom of Prussia |
Duke Nicholas of Württemberg (German: Herzog Nikolaus von Württemberg; 1 March 1833 – 22 February 1903) was an officer in the army of the Austrian Empire.
Duke Nicholas was born at Carlsruhe, Kingdom of Prussia (now Pokój, Poland) was the third child of Duke Eugen of Württemberg (1788–1857, son of Duke Eugen of Württemberg and Princess Louise of Stolberg-Gedern) by his second marriage to Princess Helene of Hohenlohe-Langenburg (1807–1880, daughter of Charles Louis, Prince of Hohenlohe-Langenburg and Countess Amalie of Solms-Baruth). Nicholas had three half-siblings by his father's previous marriage with Princess Mathilde of Waldeck and Pyrmont.
After attending high school in Breslau and studied at Leibniz University Hannover. He was initially in the Austrian navy, and later in the Austrian Army. In 1860 he reached the rank of Major, in 1864 he participated in the Second Schleswig War and in 1866 at the Austro-Prussian War.
Then he traveled to Spain and North Africa. Since 1877, he was a Major General and Brigadier General in Kraków, in 1882 he stationed as a lieutenant and division commander in Komarno.
On 8 May 1868, in Carlsruhe, he married Duchess Wilhelmine of Württemberg (1844–1892), daughter of Duke Eugen of Württemberg and Princess Mathilde of Schaumburg-Lippe. Wilhelmine was the elder daughter of Nicholas' half-brother. They had no issue.
Since 1888, Duke Nicholas lived in Carlsruhe (now Karlsruhe), where he operated as agriculture and forestry, and carried out studies on the fishing industry. As a member of the House of Württemberg in 1855 he had a seat in the Estates of Württemberg.
Nicholas died on 22 February 1903. At his death the third branch of the House of Württemberg (Carlsruhe) became extinct in the male line. His funeral took place on 27 February 1903. According to his will, Carlsruhe was passed to King William II, which he had from 1903 to his death in 1921, annually the King spent several weeks in hunting vacation at Carlsruhe. After The King's death Carlsruhe and the headship of the House of Württemberg went to Duke Albrecht (1865–1939).