This chapter covers the life and work of political theorist Hannah Arendt. It explains Arendt’s theory of totalitarianism alongside her central arguments and idiosyncratic methodology. The chapter then examines her theory of revolution which distinguished liberation as the overthrow of an old oppressive regime and revolution as the establishment of a new order of freedom. The chapter also examines Arendt’s attempt to offer a new political theory attuned to the post-totalitarian present, exploring the key concepts of action, speech, natality, plurality, freedom, and politics. It discusses criticisms of Arendt’s theories related to her cultural biases and racial prejudices and considers the ambivalence of her legacy of feminist theory.