Boris Souvarine (1895 – 1 November 1984), also known as Varine, was a French Marxist, communist activist, essayist and journalist. A founding member of the French Communist Party, Souvarine is noted for being the only non-Russian communist to have been a member of the Comintern for three years in succession. He famously authored the first biography of Joseph Stalin, published in 1935 as Staline, Aperçu Historique du Bolchévisme (Stalin, Historic Overview of Bolshevism) and kept close correspondence with Vladimir Lenin and Leon Trotsky until their deaths.