Within international relations scholarship, the nature of international organizations and their relationship with each other and nation-states has been widely contested. This edited volume brings together a team of experts to shed new light on inter-organizational relations in world politics. The book covers areas from the rule of law and international security to business and sport. Through its analysis, it demonstrates that, just as inter-organizational relations themselves are diverse and complex, research on this topic should also be pluralistic in order to draw new and valuable results and insights.