Alexander Leonidovich Kaidanovsky (Russian: Алекса́ндр Леони́дович Кайдано́вский; 23 July 1946 — 3 December 1995) was a Soviet and Russian actor and film director.

His best known roles are in films such as At Home Among Strangers (1974), The Bodyguard (1979) and Stalker (1979).

Prior to pursuing an acting career, Kaidanovsky attended technical college where he was training to become a welder. Apparently a prospect of becoming a worker did not appeal to him and in 1965 he started studying acting at The Rostov Theatre School and the Schukin Institute in Moscow. Before completing the course he took his first part in the film The Mysterious Wall (1967) and upon graduation in 1969, he worked as stage actor.In 1985 he directed A Simple Death, which was screened in the Un Certain Regard section at the 1987 Cannes Film Festival.Kaidanovsky made his theatre debut at the Vakhtangov Theatre in 1969. In 1971 he was invited to join the Moscow Arts Theatre, the best classical theatre in Russia, a rare privilege for a 25-year-old graduate.He made his major film debut in At Home Among Strangers (1974), and over the next few years appeared in some two dozen films, including the satirical comedy Diamonds for Dictatorship of the Proletariat (1976) and The Life of Beethoven (1980). At his peak in the '70s Kaidanovsky was among Soviet Russia's most popular actors, and it was at this point that famed Soviet director Andrei Tarkovsky, impressed by the looks and the acting technique of Kaidanovsky in Diamonds, invited him to play the title-role in his new film, Stalker (1979). This role earned Kaidanovsky international acclaim.