Heinrich Cunow (11 April 1862, Schwerin, Mecklenburg-Schwerin — 20 August 1936) was a German Social Democratic Party politician and a Marxist theorist. Cunow was originally against the First World War in 1914 but later supported it. He edited the Social Democratic theoretical journal Die Neue Zeit from 1917 to 1923, after Karl Kautsky. Cunow was appointed in 1919 as a professor at the Humboldt University of Berlin.