October: Ten Days That Shook the World is a 1928 Soviet silent historical film written and directed by Sergei Eisenstein and Grigori Aleksandrov. It is a celebratory dramatization of the 1917 October Revolution commissioned for the tenth anniversary of the event. Originally released in the Soviet Union as October, the film was re-edited and released internationally as Ten Days That Shook The World, after John Reed's popular 1919 book on the Revolution.

Sergei Mikhailovich Eisenstein was a Soviet film director, screenwriter, film editor and film theorist. He was a pioneer in the theory and practice of montage. He is noted in particular for his silent films Strike (1925), Battleship Potemkin (1925) and October (1928), as well as the historical epics Alexander Nevsky (1938) and Ivan the Terrible. In its 2012 decennial poll, the magazine Sight & Sound named his Battleship Potemkin the 11th-greatest film of all time.