| Honorific Prefix: | Graf |
| Wilhelm von Mirbach-Harff | |
| Birth Date: | 2 July 1871 |
| Birth Place: | Bad Ischl, Austria-Hungary |
| Death Place: | Moscow, Russian SFSR |
| Office: | German Ambassador to Russia |
| Term Start: | April 1918 |
| Term End: | July 1918 |
Wilhelm Maria Theodor Ernst Richard Graf von Mirbach-Harff (2 July 1871 - 6 July 1918) was a German diplomat. He was assassinated while ambassador to Moscow.
Born in Bad Ischl in Upper Austria into a Catholic Rhenan aristocratic family, he was a scion of, founder of the Knight academy. His parents were Ernst Graf von Mirbach and his wife Wilhelmine von Thun-Hohenstein (1851–1929).
von Mirbach started his diplomatic career in London, where he was Third Secretary at the German Embassy from 1899 til 1902, when he transferred to The Hague. From 1908 to 1911, Mirbach served as the embassy clerk in Saint Petersburg, and then as political councillor for the German military command in Bucharest. In 1915 he became the German ambassador in Greece, before being expelled from Athens in December 1916 when the Entente-leaning government of Eleftherios Venizelos took power.[1]
He participated in the Russian-German negotiations in Brest-Litovsk from December 1917 to March 1918. He was appointed German ambassador to Russia in April 1918.
Mirbach was assassinated at the German embassy in Moscow by Yakov Grigorevich Blumkin and Nikolai Andreyev at the request of the Central Committee of the Left Socialist-Revolutionaries, who were trying to reignite the war between Russia and Germany. Blumkin entered Mirbach's residence in Moscow using forged papers and shot his victim at point blank range. As Mirbach tried to escape, Andreyev fired a second bullet and both of the assassins leapt out of the window and then drove away in a Cheka car.[2] Mirbach's assassination signaled the beginning of the revolt of the Left Socialist-Revolutionaries in Moscow in 1918.
Mirbach was succeeded as German ambassador to Russia by Karl Helfferich.
Coincidentally, a later relative, Andreas von Mirbach, would be murdered by the Red Army Faction at the West German Embassy siege in Stockholm in 1975.
He received the following orders and decorations: