Valentin Fyodorovich Bulgakov (Russian: ???????? ????????? ????????; 25 November 1886 in Kuznetsk, Russian Empire – 22 September 1966 in Yasnaya Polyana, Tula Oblast, Soviet Union) was the last secretary of Leo Tolstoy and his biographer.
He was director of a number of literary museums and was engaged in Tolstoyan, pacifist, and anti-communist activities.
He was imprisoned by both the Tsarist and Soviet regimes and was a Nazi concentration camp survivor.
During the final 20 years of his life he was head of the Yasnaya Polyana museum.