<![CDATA[Background: Schools face challenges in maintaining organizational sustainability amid changing educational demands, technology, and community needs. Human resource competence, workplace spirituality, and sustainable leadership are important factors that may support school organizational sustainability. However, their interrelationships in secondary education remain insufficiently explored Objective: This study aims to examine the direct influence of human resource competency (HRC) on organizational sustainability (OS), sustainable leadership (SL) on organizational sustainability (OS), HRC on workplace spirituality (WPS), WPS having a significant influence on sustainable leadership (SL), and the indirect influence of HRC on organizational sustainability (OS) through WPS. Methods: This study employed a quantitative methodology. A total of 106 questionnaire responses were collected from questionnaires distributed to principal assistant departments in 25 high schools and vocational high schools across the Diocese of Surabaya. The sample was determined using a census approach, meaning all departments, particularly those assisting the principal, were included in the sample. The data were processed using Structural Equation Modeling (SEM) with the SmartPLS program. Results: The results indicate that HRC does not have a direct and significant influence on OS, but it does have a significant influence on WPS. WPS is shown to have a significant influence on SL, and WPS has a significant influence on OS. WPS was not effective as a sole mediator of the effect of HRC on OS. Conclusion: Several studies on this topic suggest further research with other variables. The results provide empirical evidence and managerial implications that each variable should be considered to further improve OS.]]>
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