Aleksandr Demyanenko was born in Sverdlovsk, Soviet Union in 1937. Aleksandr's mother, Galina Belkova was an accountant. His father, Sergei Petrovich, was an actor who graduated from the Lunacharsky State Institute for Theatre Arts. Sergei later worked as a director at the Sverdvlosk Opera Theatre, and as a child Aleksandr played bit parts at the theatre. Aleksandr attended a theater workshop at the Palace of Culture and parallel to that he studied piano at a music school. He also learned foreign languages with an emphasis on German in middle school and in high school started to sing in a baritone. In 1954 he began to study jurisprudence at the Sverdlovsk University of Law, but was expelled from the first semester for skipping lessons. In 1954 he failed to get into the Moscow Art Theatre, however in 1955 he was accepted both at the Lunacharsky State Institute for Theatre Arts and at the Boris Shchukin Theatre Institute in Moscow. He ended up choosing Lunacharsky.

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