This study investigates the strategic role of Green Human Resource Management (Green HRM) practices in promoting sustainable organizational performance. Focusing on four key HR functions Training and Development, Employee Engagement, Recruitment, and Performance Management the research aims to evaluate their individual impact on environmental sustainability within organizations. Using a quantitative research approach and independent sample t-tests, data were collected from employees and HR professionals across various sectors. The findings revealed that Training and Development, Recruitment, and Performance Management significantly contribute to sustainable outcomes, while Employee Engagement did not show a statistically significant effect. These results suggest that although some green initiatives are effectively influencing sustainability, others require stronger strategic alignment and implementation. The study highlights the need for organizations to integrate green practices into core HR functions not just for compliance, but as a proactive strategy to drive long-term environmental and organizational success. Recommendations are provided to enhance Green HRM implementation for greater sustainability impact.