Sergei Dmitrievich Vasilyev (4 November 1900 – 16 December 1959) was a Soviet film director, editor, and screenwriter.
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 1918 Battle for 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.