Konstantin Sergeyevich Lopushansky (Russian: Константин Сергеевич Лопушанский; born June 12, 1947) is a Soviet and Russian film director, film theorist and author. He is best known for directing post-apocalyptic films Dead Man's Letters (1986), A Visitor to a Museum (1989), Russian Symphony (1994) and The Ugly Swans. He also assisted Andrei Tarkovsky in directing the legendary film Stalker, based on the novel Roadside Picnic by Boris Strugatsky.