The term “social world” is increasingly familiar in philosophy and political theory. Rawls uses it quite often, especially in his later works. But there has been little explicit discussion of the term and the idea of social worlds. My aim in this paper is to show that political philosophers, Rawlsian or not, should think seriously about social worlds and the roles these things play and ought to play in their work. The idea of social worlds can help political philosophers think (...) about what they do in new and fruitful ways and enrich debates about the roles, aims, and methodology of political philosophy. I begin by analyzing Rawls’s uses of “social world.” I then propose a broadly Rawlsian conception of social worlds as logically possible closed networks of social relations between agents. Next, I put this conception to work, arguing that the idea of navigating the landscape of social worlds can help us better understand the four apparently disparate roles of political philosophy that Rawls presents. Moving beyond Rawls interpretation, I use the idea of social worlds to develop an analogy and distinction between world-oriented and principle-oriented approaches to political philosophy. While principle-oriented approaches grant centrality and importance to engagement with principles of justice, legitimacy, or other political concepts, world-oriented approaches grant centrality and importance to engagement with social worlds. I propose two examples of world-oriented approaches, political philosophy as navigation and political philosophy as world-building, and argue that they are viable and worthy of further consideration. (shrink)