The study looks at the connections between employee organizational citizenship behavior (OCB), leader-member exchange (LMX), and organizational justice (OJ), while examining the moderating role of organization-based self-esteem (OBSE). The partial least squares structural equation modeling (PLS-SEM) technique was used to survey 425 workers from tourism businesses in the Mekong Delta region of Vietnam. The findings show that LMX, OCB, and organizational justice are positively correlated. Furthermore, organizational-based self-esteem (OBSE) moderates the link between organizational justice and OCB, enhancing the influence of organizational justice on OCB, while LMX partially mediates this association. The model explains 55.8% of the variance in OCB, demonstrating substantial predictive power. These findings contribute to theory by integrating OBSE into the justice–behavior framework and validating the mediating role of LMX. Furthermore, the study provides managerial implications, suggesting strategies to enhance organizational justice, improve leader-member relationships, and boost employees' self-esteem, ultimately fostering positive employee behaviors. Future research should explore longitudinal effects and extend the model to other service sectors for broader generalizability.
