This article discusses the relationship between Paul Feyerabend and Marxism. Feyerabend mentioned, referenced, quoted, discussed or commented on the following Marxists, communists or leftists in his writings: Marx, Engels, Lenin, Stalin, MAO, Fidel Castro, Karl Kautsky, Eduard Bernstein, Rosa Luxemburg, Leon Trotsky, Bertolt Brecht, Hanns Eisler, Walter Hollitscher, Georg Lukacs, Ernst Bloch, Herbert Marcuse, Theodor Adorno, Jürgen Habermas, Joseph Needham, Jean-Paul Sartre, Walter Benjamin, Louis Althusser, Daniel Cohn-Benit and Robin Blackburn. On numerous occasions he discussed and commented on Dadaism, Marxism, communism, anarchism, liberalism, dialectical materialism, reductive materialism and, especially, eliminative materialism. He originated a Dadaistic philosophy, and in particular a Dadaistic epistemology. He did not convert to dialectical materialism; nevertheless, Dadaism seems highly relevant to Marxism and communism. As a Dadaist in philosophy he could well have been a Marxist, a non-Marxist, or an anti-Marxist.