Organizational design is composed of structure, the artifact, and coordination, the action. Existing organizational design literature lacks coherence, resulting in models that overlook the importance of coordination as an organizational design issue, which intensifies in megaprojects. We explore the roles of clients when designing megaproject organizations, identifying four coordination roles: (1) meta-organizer, (2) gatekeeper, (3) interface manager, and (4) mediator. These roles align with management levels (strategic, tactical, operational), corresponding to megaproject phases and organizational design development. The conceptual framework contributes to the organizational design literature by providing a systems-wide view and enriching the understanding of the multilevel coordination roles of clients.