The volume LNAI 15398 constitutes the revised selected papers of the 28th International Workshop on Coordination, Organizations, Institutions, Norms, and Ethics for Governance of Multi-Agent Systems, COINE 2024, held in Auckland, New Zealand, on May 7, 2024. The 9 full papers were carefully reviewed and selected from 10 submissions. The workshop focuses on both scientific and technological aspects of social coordination, organizational theory, artificial (electronic) institutions, and normative and ethical MAS.