Andrew Arato (Hungarian: Arató András [ˈɒrɒtoː ˈɒndraːʃ]; born 22 August 1944) is a critical theorist and a professor of Political and Social Theory in the Department of Sociology at The New School. He is best known for his influential book Civil Society and Political Theory, coauthored with Jean L. Cohen. He is also known for his work on critical theory and constitutions and was from 1994 to 2014 co-editor of the journal Constellations with Nancy Fraser and Nadia Urbinati.

Arato first attended Queens College in New York City, completing his B.A. in history in 1966. Subsequently, Arato moved to the University of Chicago to complete his M.A. in 1968 and Ph.D. in 1975 with a dissertation entitled 'The Search for the Revolutionary Subject: The Philosophy and Social Theory of the Young Lukács 1910-1923' under the guidance of Leonard Krieger and William H. McNeill. In preparation for his dissertation, Arato conducted preliminary research at the Hungarian Academy of Sciences in the spring of 1970 under the guidance of Budapest School scholars Ágnes Heller, György Márkus, and Mihály Vajda.

A distinct chronology defines Arato's intellectual biography, which often parallels and was inspired by the evolution in thinking of opposition intellectuals in the former communist countries of Eastern Europe and, most especially, in Hungary, the country of Arato's birth. At the same time, much of his work was hammered out in conjunction with his longtime intellectual partner Jean L. Cohen, and strongly influenced by the philosophical and sociological work of Jürgen Habermas.

Arato's intellectual itinerary can be simplified into four overlapping stages: It begins with (I) efforts to revitalize Marxism by drawing on a Hegelian Marxist philosophy of "praxis".”In a second phase, (II) Arato worked through the corpus of Western Marxian thinkers to construct a critical theory of state socialist societies. Phase three was (III) marked by a turn to a post-Marxist emphasis on civil society as a moral and analytical category meant to further the project of democratization in both the East and West. Finally, in his latest work, (IV) Arato engages in comparative studies of recent constitution making and has developed a theory of “post-sovereign” constitution making.^{[citation needed]}

The first phase of Arato's academic work emphasized the recovery of an early humanistic Hegelian Marxism. Such Hegelian Marxism highlighted the active constitution of the social order through "praxis," that is, the collective action of interacting groups. Arato's philosophical investigations here paralleled the thought of critical intellectuals in the East and especially the "Budapest School" in a “renaissance of Marxism” during the 1960s and early 1970s. This perspective was also manifested in the philosophical outlook of the American journal of radical theory Telos. Arato served on Telos’s editorial board from 1971 to 1984.

Arato's emphasis on social praxis and the concomitant categories of subjectivity, culture and alienation was displayed in his dissertation on the early 20th-century Marxian philosophy of György Lukács. As Arato notes in his 1979 book, The Young Lukacs and the Origins of Western Marxism, the elaboration of a critical Western Marxism with its emphasis on intentional collective action or praxis was also intended as a critique of the authoritarian communist governments in Eastern Europe. Arato's praxis theory and Western Marxism in general privileged the active, democratic participation of groups and individuals in their supposedly collective self-determination, and they criticized orthodox communist parties with their claims to know the true interests of the working class and to be able to make the proper decisions for them in a form of “substitutionalism.” In contrast to the control of the communist state with its enforced passivity of working classes, “true socialism,” said Western Marxists, should be democracy – democracy extended from the political sphere to the economy and indeed to all social institutions. This implicit critique of state socialist societies, however, largely operated at the level of abstract social philosophy. As Hungarian critics Gyorgy Bence and Janos Kis noted, this rebirth of Marxian philosophy in the East “sidestepped the problem of basic class antagonism” intrinsic to the socialist dictatorships of Eastern Europe.

In the second stage of his intellectual itinerary, Arato made this exact turn from social philosophy to the critical analysis of East European social formations during the late 1970s to the early 1980s.

His operating procedure was somewhat scholastic. One after another, Arato examined neo-Marxist analyses of state socialism written by such authors as Herbert Marcuse, Cornelius Castoriadis, Rudolf Bahro, Habermas, and Iván Szelényi. He critically assessed the adequacy of their efforts to analyze the social dynamics, stratification, crisis potentiality and legitimating ideology of state socialist societies. In all this, Arato sought to model himself on Marx by analyzing and criticizing the exploitative, hierarchical dimensions of the social formation. He recognized, however, that the theoretical tools offered by Marx himself – that is, historical materialism – were often used by state socialist societies to veil their politically based class inequalities, not expose them.