Intellectual capital (IC) has become one of the most valuable resources of an organization. As awareness of sustainable practices increases, a new concept emerges: Green Intellectual Capital (GIC). However, research on GIC is still scarce, especially when discussing its relationship with sustainable organizational performance in educational organizations. Through a case study conducted on all universities in the North Sulawesi region, this study aims to assess how the organization's internal stakeholders understand the concepts of GIC, sustainability, and sustainable performance and to better understand the effects of GIC on economic, social, environmental and sustainable organizational performance. Evidence shows that stakeholders do not understand the concept of GIC and only emphasize the environmental dimension of the concept of sustainability and sustainable performance. Furthermore, it was found that the organization's sustainable performance is influenced by all components of GIC, namely Green Human Capital (GHC). Green Structural Capital (GSC) and Green Relational Capital (GRC). This study contributes to the development of different but complementary research areas namely Intellectual Capital, education and sustainability. This research has important managerial implications for educational organizations that are concerned with organizational performance within the scope of education. Generalization to the next research should only be done theoretically. it was found that the organization's sustainable performance is influenced by all components of GIC namely Green Human Capital (GHC). Green Structural Capital (GSC) and Green Relational Capital (GRC). This study contributes to the development of different but complementary research areas namely Intellectual Capital, education and sustainability. This research has important managerial implications for educational organizations that are concerned with organizational performance within the scope of education. Generalization to the next research should only be done theoretically. it was found that the organization's sustainable performance is influenced by all components of GIC namely Green Human Capital (GHC). Green Structural Capital (GSC) and Green Relational Capital (GRC). This study contributes to the development of different but complementary research areas namely Intellectual Capital, education and sustainability. This research has important managerial implications for educational organizations that are concerned with organizational performance within the scope of education. Generalization to the next research