According to ‘global institutionalism,’ individuals who do not share a state have duties of justice to one another, and this is explained, in part, by the institutional connections that obtain between them. In this chapter, I defend this view against two challenges. First, I consider challenges raised by ‘non-institutionalists,’ who deny that facts about global institutional interaction bear on the nature of duties of justice that arise between particular individuals. Second, I address challenges posed by ‘domestic institutionalists,’ who accept the (...) claim that facts about institutional interaction bear upon the scope of justice but deny that the right sort of interaction necessary to ground duties of justice is found in the global domain. (shrink)