<![CDATA[Environmental sustainability has emerged as a defining dimension of institutional legitimacy in higher education, driven by the global expansion of the Sustainable Development Goals (SDGs) and growing expectations for universities to demonstrate ecological responsibility. Within Islamic higher education, however, a persistent gap remains between rich theological doctrines concerning environmental stewardship and the limited institutionalization of ecological identity within governance and reputation management practices. This study aims to examine how ecological identity can be constructed through the integration of Eco-Islamic values, sustainability management, and green branding strategies. Employing a Systematic Literature Review (SLR) guided by the PRISMA protocol, the study synthesizes scholarly publications indexed in Scopus and SINTA between 2016 and 2026. The review reveals that existing scholarship largely treats Islamic environmental ethics, sustainability governance, and green branding as separate domains, resulting in fragmented conceptual understanding. In response, this study develops the Eco-Islam Green Branding Architecture, a novel conceptual framework that links theological values, institutional sustainability practices, and environmental communication within a unified model of ecological identity formation. The framework contributes both theoretically and practically by providing a pathway through which Islamic higher education institutions can cultivate authentic ecological legitimacy and advance toward the realization of a Sustainable Islamic University]]>
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