Dmitri Feodorovich Trepov (transliterated at the time as Trepoff) (15 December 1850 – 15 September 1906) was Head of Moscow police; Governor-General of St. Petersburg with extraordinary powers; Assistant Interior Minister with full control of the police. His attempts to restore order were overwhelmed by the revolution of 1905; he retained influence with the Tsar Nicholas II, when appointed as the Commandant of the Imperial Palace.
Dmitri was the second son of General Fyodor Trepov who was involved in the suppression of the January Uprising in 1864 and appointed as the mayor of St Petersburg. Dmitri was the brother of A. F. Trepov, Vladimir F. Trepov, and F. F. Trepov, Jr.
After his education and training in the Corps des Pages, Trepov participated in the Russo-Turkish War (1877–78).
He was involved in the 'Third Section', named by Grand Duke Sergei, Governor General of Moscow Governorate. In 1896 he became Chief Police of Moscow, where he took a strong line against student agitators. The year after he was shot and wounded in his leg.
A few days after Bloody Sunday (1905), on 12 January 1905 (O.S.), Trepoff was appointed in St Petersburg (the capital of the Russian Empire) to become Governor General of the Saint Petersburg Governorate with full power to forbid all congresses, associations, or meetings. He took his residence in the Winter Palace. Along with Plehve and Count Ignatyev Trepov promoted a policy of repression and anti-Jewish persecution. He personally edited pamphlets.