Boris Georgiyevich Bazhanov (Russian: ????? ?????????? ???????; 9 August 1900 – 30 December 1982) was a Soviet secretary of the Secretariat of the Communist Party of the Soviet Union that defected from the Soviet Union on 1 January 1928.
Bazhanov was the personal secretary of Soviet leader Joseph Stalin from August 1923 to 1925 and held several prominent secretarial positions in the Politburo until defecting from the Soviet Union in 1928.
Bazhanov was granted French citizenship and survived subsequent Soviet assassination attempts, writing and publishing memoirs and books from 1930 about the secrets behind Stalin's actions, which continued to be published and translated after his death in 1982.
Bazhanov was the only assistant of Stalin's Secretariat to have defected and one of the first major defectors from the Eastern Bloc.