Sergei Dmitrievich Vasilyev (Russian: Серге́й Дми́триевич Васи́льев; 4 November 1900, Moscow – 16 December 1959, Moscow) was a Soviet and Russian film director, screenwriter and actor. From 1928 to 1943 together with Georgi Vasilyev (often jointly, though incorrectly credited as the Vasilyev brothers) he co-directed several films, including the influential and critically acclaimed Chapaev (1934). Sergei Vasilyev was granted the honorary title of People's Artist of the USSR in 1948; and received (with Georgi Vasilyev) two Stalin Prizes in 1941 and 1942.
His 1942 film The Defence of Tsaritsyn concerns the Battle of Tsaritsyn during the Russian Civil War, a battle in which Joseph Stalin played a prominent role. In 1942, Tsaritsyn, by then renamed Stalingrad, was in the midst of the decisive Battle of Stalingrad, a turning point of the Second World War.