Glumov's Diary is a 1923 Soviet silent trick film, which was the first film directed by Sergei Eisenstein. It was conceived as a part of the theatre production of Alexander Ostrovsky’s 1868 comedy Enough Stupidity in Every Wise Man and it marks Eisenstein's transition from theatre stage director to film director.

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.