In this study, we focus on Organizational Citizenship Behavior (OCB) as an extra role behavior and seek to examine the moderation of Organizational Citizenship Behavior mediated to Organizational Citizenship Behavior in the context of developing countries. This study aims to analyze the effect of Organizational Effectiveness, Organizational Citizenship Behavior, Happiness at Work, and Self-Efficacy, on employees of PT Bank Cimb Niaga, Tbk in Jakarta. This research was carried out in the form of a field study and used SPSS Amos data because the data was collected only at one time to look for relationships between variables. This sample was taken from employees of Private Banking Services, West Jakarta, in the customer, teller, marketing, finance, accounting, and IT department as respondents. The population studied is 240 employees in Private Banking Services in West Jakarta. The description of data describes the respondents' characteristics based on the questionnaire's criteria. Male and female respondents have the same number because the sampling was conducted in the customer service, teller, marketing, finance, accounting, and IT divisions. Happiness at Work positively and significantly affects Organizational Citizenship Behavior at PT. Bank Cimb Niaga, Tbk in Jakarta. Self Efficacy has a positive and significant effect on Organizational Citizenship Behavior at PT. Bank Cimb Niaga, Tbk in Jakarta. Organizational Citizenship Behavior has a positive effect on Organizational Effectiveness at PT. Bank Cimb Niaga, Tbk in Jakarta.