This research aims at investigating the relationship between Green Procurement Practices (GPP), Green Organizational Cultures (GOC), and Sustainable Performance (SP) within Higher Education Institutions (HEIs) in Palestine, specifically the role of GOC in mediating the relationship between GPP and SP using Partial Least Squares Structural Equation Modeling (PLS-SEM). Data from employees and procurement department managers at Palestinian HEIs was collected using a structured questionnaire. Following that, a PLS-SEM approach was employed to test the hypotheses and analyze the relationship, and the model was tested for reliability and validity through values of composite reliability, Cronbach's alpha, and average variance extracted, and relationships were established based on path coefficients, T-Values, and P-Values. Mediation was tested using the Bootstrapping technique. Statistical findings
