This study examines the influence of organizational commitment and job satisfaction on employee well-being, with Organizational Citizenship Behavior (OCB) serving as a mediating variable, at PT Dwima Jaya Utama, Central Kalimantan. Employee well-being is a critical issue in human resource management, as it affects employees' psychological condition, performance, and sustainability at work. The objective of this research is to analyze both the direct and indirect relationships among these variables. This study employs a quantitative approach using a causal-comparative (ex post facto) design. Data were collected through questionnaires distributed to 97 office employees using a census method and analyzed using Structural Equation Modeling–Partial Least Squares (SEM-PLS). The results show that organizational commitment does not have a significant direct effect on employee well-being but has a positive and significant effect on OCB. Meanwhile, job satisfaction significantly influences both employee well-being and OCB. OCB also has a significant positive effect on employee well-being and mediates the relationship between organizational commitment and job satisfaction on employee well-being. In conclusion, employee well-being is influenced more by job satisfaction and social behavior (OCB) than by commitment alone
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