This paper addresses a significant gap in the existing literature by investigating the pivotal role of green HRM in promoting sustainability within the hotel setting. Further, this paper explores the mediating effect of organizational culture and the moderation effect of employee environmental proactivity. A structured questionnaire was administered to 369 frontline employees across 35 five-star hotels in Greater Cairo, Alexandria and Sharm Elsheikh. The results proved a positive nexus between green HRM and organizational sustainability through the partial mediation of organizational culture. Further, employee environmental proactivity strengthened the nexus between organizational culture and both green HRM and organizational sustainability. This paper promises to offer valuable insights for the Egyptian hotel industry, indicating how green HRM can drive sustainability and contribute to competitive advantages in an increasingly environmentally conscious world. Accordingly, our findings recommend that hospitality organizations incorporate employee attitudes that drive organizational green management and foster a culture of rewarding employees for their environmentally conscious behavior, which has the potential to change overseas customers' perceptions of Egyptian hotel settings and their services.