This paper investigates the catalytic role of Green Human Resource Management (GHRM) in promoting sustainable organizational performance through enhanced Employee Environmental Performance (EEP). The primary aim is to explore the direct and indirect effects of GHRM on EEP, with Individual Green Values (IGV) as a mediator and Green Employee Empowerment (GEE) as a moderator. The present study adopted a mixed-method approach, which made the best use of the quantitative data analysis through ANOVA, mediation, and moderation analysis, along with qualitative thematic analysis through the case study. Research results reveal that GHRM has a positive and significant effect on EEP directly. IGV partially mediates the relationship, and GEE positively moderates this relationship – in other words, GHRM has a higher impact on EEP. A case study, Greenway Enterprises, only serves to underline these findings by giving specific improvements of EEP after the implementation of GHRM policies. Therefore, GHRM seems beneficial to improve sustainable organizational performance in which the roles of IGV and GEE are essential to make it happen. The implication is that the management of the organization should incorporate GHRM within the framework of the organization’s strategy to have a sustainable culture from which the outcomes of the environment can be improved. The contribution this research makes to the literature is that it establishes through empirical ways that IGV has a mediating role and GEE has a moderating role in the GHRM-EEP relationship. This paper is the first one to provide new insight into the combined effect of human resource management with the individual values of employees on environmental performance within the organization. This research is pioneering in its examination of the simultaneous influence of GHRM policies and the individual green values (IGV) of employees on their environmental performance within the organization. By integrating these dimensions, it provides a more holistic understanding of how personal and organizational factors interact to enhance sustainable practices.