Using social identity theory, we explore how socially responsible human resources management (SRHRM) enhances employee engagement, performance, and perceived external reputation, focusing on Vietnam, an emerging market. Using a time-lagged survey of 443 employees, the findings show that SRHRM improves employee engagement and performance through external reputation while also demonstrating the moderating effect of leadership vision on these relationships. The study highlights the importance of leadership vision and SRHRM in building a strong organisational identity, boosting employee morale, and enhancing external reputation. The practical implications suggest that organisations can leverage SRHRM and leadership vision to create a more sustainable competitive advantage.