Conservatism refers to one of the constituent political positions found in all contemporary democracies. It can be construed as a philosophy, an ideology, a political party, a movement, a disposition, a mode of discourse, performance style, and an emotional relationship to the political. Since the birth of modern democracies in the aftermath of the French Revolution, it has become commonplace to describe the range of political options available to the citizenry as occupying a spectrum from left to right, with a range of alternatives between the extreme poles, including a centrist position in the middle that straddles the divide. The left was associated with promoting challenges to established authorities and existing hierarchies, along with calls for increased economic equality and expanded social and political rights to all citizens, including the heretofore marginalized. This contrasts with the right, which was defined as defending inequalities and differential entitlements, concentrating matters involving rights around preserving property rights, shoring up public and social order, and promoting traditional values and conventional social relations. In this context, liberalism became a mark of political identity associated with the left, as did socialism, while conservatism, broadly construed, represented the right. This framing of politics also includes the possibility of underminings by extremism on both the left and right. For the former, the main threat since the Russian Revolution has been posed by revolutionary communism, while right-wing extremism has manifested itself in reactionary movements, including fascism and illiberal populism. Since liberalism and conservatism must be understood in relational terms, the spatial and temporal settings for the politics of opposition will vary considerably. It is impossible to do justice to the vast literature on conservatism in a bibliography such as this. What follows is a more delimited, and thus manageable examination of work on conservatism. First, it focuses on conservatism in the United States, and not elsewhere. Second, it is chiefly concerned with conservatism since the end of World War II. Third, it concentrates on the study of conservatism by sociologists and those working in cognate disciplines; while not all the authors are card-carrying sociologists, their works reflect a sociological character, although the exception to this third point is the overview section, which presents key readings by advocates of conservatism, and thus offers insider depictions of the meaning of conservatism. Fourth, this article does not concentrate solely on extremist right-wing movements; rather, in surveying the relevant literature on American conservatism broadly construed, it points to a growing consensus that the radical right wing has pushed mainstream conservatism increasingly further to the right.