The 21st century has spotlighted environmental sustainability in global discourse, urging businesses to act responsibly amidst climate change and resource depletion. This study explores the role of green human resource management (GHRM) in fostering the New Ecological Paradigm (NEP) among employees, enhancing organizational commitment (OC), and promoting organizational citizenship behavior towards the environment (OCBE) within the hospitality industry. Findings demonstrate that GHRM practices, including green recruitment, training, and performance management, significantly improve environmental performance and employee engagement in sustainability initiatives. Data were collected from 382 employees working in 5-star hotels in South Korea, utilizing a structured online survey to gather insights into GHRM’s influence on NEP, OC, and OCBE. The analysis was conducted using covariance-based structural equation modeling (CB-SEM) to rigorously test the hypothesized relationships among these constructs. However, integrating GHRM with NEP presents challenges, such as aligning organizational culture with eco-centric values and overcoming resistance to change. Motivated by the urgent need for sustainability, this research underscores the necessity for integrated HRM approaches to achieve sustainability. A key motivation behind this integration is to establish a workforce that not only understands but actively champions environmental stewardship, thereby strengthening the organization’s reputation and competitive advantage. Additionally, challenges such as balancing short-term operational costs with long-term environmental goals persist, requiring strategic commitment and effective resource allocation. Recommendations include embedding sustainability in HR policies, providing comprehensive environmental training, incentivizing green initiatives, establishing robust monitoring systems, and fostering cross-departmental collaboration to reduce the ecological footprint. This study contributes to the growing body of literature on sustainable business practices and highlights the strategic importance of eco-leadership.