Sport clubs are one of the main providers of sport activities. Collaborations with other non-profit sport organisations (such as other sport clubs or sport federations) have become increasingly relevant for sport clubs to achieve their goals. However, these particular collaborations, called non-profit sport collaborations, are challenging and often not very effective. Yet, few studies have focused on this distinct type of collaboration. The purpose of this dissertation is to examine these non-profit sport collaborations with a specific focus on non-profit sport collaborations involving sport clubs. This dissertation addresses two main research questions: (1) What are the antecedents of non-profit sport collaborations involving sport clubs? (2) How can these collaborations be managed to make them effective? Theoretical and practical implications are formulated for sport clubs, sport federations and policy-makers to foster effective collaborations within federated sport systems. ; (MOTR - Sciences de la motricité) -- UCL, 2021