Boris Viktorovich Savinkov (Russian: Бори́с Ви́кторович Са́винков; 31 January 1879 – 7 May 1925) was a Russian writer and revolutionary. As one of the leaders of the Fighting Organisation of the Socialist Revolutionary Party, he became involved in the assassinations of several high-ranking imperial officials in 1904 and 1905.
After the February Revolution of 1917, he became Assistant War Minister (in office from July to August 1917) in the Provisional Government. After the October Revolution of the same year he organized armed resistance against the ruling Bolsheviks. Savinkov emigrated from Soviet Russia in 1920, but in 1924 the OGPU lured him back to the Soviet Union and arrested him. He was either killed in prison or committed suicide.