Grigori Vasilyevich Aleksandrov (23 January 1903 – 16 December 1983, known by artist name Mormonenko) was a Soviet film director who was named a People's Artist of the USSR in 1947 and a Hero of Socialist Labour in 1973. He was awarded the Stalin Prizes for 1941 and 1950.

Initially associated with Sergei Eisenstein, with whom he worked as a co-director, screenwriter and actor, Aleksandrov became a major director in his own right in the 1930s, when he directed Jolly Fellows and a string of other musical comedies starring his wife Lyubov Orlova.

Though Aleksandrov remained active until his death, his musicals, amongst the first made in the Soviet Union, remain his most popular films. They rival Ivan Pyryev's films as the most effective and light-hearted showcase ever designed for the Stalin-era USSR.

Aleksandrov was born in Yekaterinburg, Russia in 1903. Starting at age nine, Aleksandrov worked odd jobs at the Ekaterinburg Opera Theater, eventually making his way to assistant director. He also pursued a musical education, studying violin at the Ekaterinburg Musical School, from which he graduated in 1917.

Aleksandrov came to Moscow after studying directing and briefly managing a movie theater. In 1921, while acting with the Proletcult Theatre he met a then 23-year-old Sergei Eisenstein. In 1923, Aleksandrov was given the main role in Eisenstein's adaptation of Alexander Ostrovsky’s 1868 comedy Enough Stupidity in Every Wise Man (Na vsyakovo mudretsa dovolno prostoty) and in Eisenstein's first film Glumov's Diary (Дневник Глумова), a short film that was included in the play. Eisenstein and Aleksandrov collaborated on several plays before Eisenstein made his first feature-length film, Strike, which Aleksandrov co-wrote with Eisenstein, Ilya Kravchunovsky, and Valeryan Pletnyov. Next came Eisenstein's landmark Battleship Potemkin, in which Aleksandrov played Ippolit Giliarovsky. Aleksandrov co-directed Eisenstein's next two features, October: Ten Days That Shook the World and The General Line, which were also their last works in the silent era.

Along with Eisenstein's other major collaborator, cinematographer Eduard Tisse, Aleksandrov joined the director when he came to Hollywood in the early 1930s. He also traveled with them to Mexico for the filming of Eisenstein's unrealized project about the country. An edited version of the footage, known as ¡Que viva México!, was put together by Aleksandrov in 1979.

Aleksandrov returned to the Soviet Union in 1932 under direct orders from Joseph Stalin. He directed a pro-Stalin film, International (Интернационал), the following year and after a meeting with Stalin and Maxim Gorky, he embarked on making the first Soviet musical, Jolly Fellows, starring Leonid Utyosov and Lyubov Orlova, whom Aleksandrov later married (Orlova had been previously married to an economist who was arrested in 1930). She starred in his most successful films: Circus, Volga-Volga, and Tanya.

The Great Patriotic War (June 1941) came when Aleksandrov and his wife Orlova on vacation near Riga, Latvia. They hurriedly returned to Moscow. During one of the Nazi air raids, Aleksandrov had got a contusion and injured his spine. He made a propaganda movie Fighting Film Collection #4 with Orlova singing a new version of the famous march from Jolly Fellows: "A horde of dark villains has attacked our laboring and jolly people..."