The quality of human resources are essential for the success and sustainability of organizations, particularly in public sector institutions such as the Ministry of Youth and Sports of the Republic of Indonesia. Workplace well-being, a critical determinant of employee performance and organizational outcomes, is influenced by multiple psychological and organizational factors. This study examines the relationships between Psychological Capital, Perceived Organizational Support, and Burnout, with Workplace Well-being, and explores the moderating role of Grit within this framework. A total of 165 employees from the Ministry of Youth and Sports participated in the study, and data were collected through a structured survey. The proposed model was tested using Partial Least Squares (PLS). The findings revealed that Psychological Capital does not have a statistically significant impact on Workplace Well-being. In contrast, Perceived Organizational Support and Burnout were found to have significant effects on workplace well-being. However, Grit, which was hypothesized to moderate the relationships between PsyCap, POS, Burnout, and Workplace Well-being, did not demonstrate a significant moderating effect. These results suggest that while Grit, is valuable, its role as a buffer against workplace stressors may be limited in the organizational context studied. This research contributes to the existing literature by providing an integrated model that examines both individual and organizational factors influencing workplace well-being. The insights from this study are particularly relevant for public sector organizations aiming to enhance workplace well-being and organizational performance. Future research should explore additional moderating factors and consider the influence of contextual variables to governmental environments.