Prince Nikolai Ivanovitch Sviatopolk-Mirskii (Russian: Николай Иванович Святополк-Мирский, Polish: Mikołaj Światopełk-Mirski, 29 July 1833 – 8 November 1898) was a Russian cavalry general and politician. In 1895 he purchased the famed Mir Castle Complex, repaired and rebuilt it.
Nikolai was born to the family of Tomasz Bogumił Jan Mirski, the ambassador of the semi-independent Kingdom of Poland to Russia. Nikolai's patronymic Ivanovich was based on a Russified form of the third name of his father. Despite being a descendant of Polish szlachta he was brought up in Saint Petersburg and considered himself Russian.
Nikolai graduated from the Page Corps and later served in the Caucasus under Mikhail Semyonovich Vorontsov. During the Russo-Turkish War, 1877-1878 he commanded a division that fought at the final Battle of Shipka Pass. Since 1881 he was the ataman of the Don Cossack Voisko. In 1898 he became a member of the State Council of Imperial Russia.
Descendants of Nikolay later emigrated to the USA and settled in Philadelphia, PA.
- (in Russian) Biography