Policy initiatives by the United Nations and EU institutions have emphasized the need for higher education institutions (HEIs) to fulfill a significant role in the green transition, and that they tend to fall short of the achievement of this objective. Multiple studies indicate that HEIs assign high importance to the integration of environmental sustainability on a strategic level but generally lack dedicated policies of integration in operational aspects. This paper analyzes the state of the art on research on HEI sustainability and maps institutional sustainability self-assessment models, tools, and guidelines. The mapping was conducted in four prominent research areas: 1) sustainability integration in educational activities, pedagogical perspectives, and systemic transformations; 2) benchmarking sustainability of organizational transformation and operational op-timization, and links between developmental priorities and educational settings; 3) whole-system approaches focusing on the design and implementation of whole-institution sustainability plans; and, 4) HEI sustainability culture and operations. Best practices were selected on criteria of 1) the effectiveness of self-assessment models, tools, and guidelines in each respective research area; 2) the degree of integration of systems thinking and/or modelling; and 3) the incorporation of qualitative indicators for stakeholder engagement.