Regulation of the Minister of Health of the Republic of Indonesia Number 72 of 2016 emphasizes the importance of competent and organized pharmaceutical human resources in supporting pharmaceutical services in hospitals. The quality of service is highly dependent on the performance of strategic human resources in realizing rational and effective treatment. The application of the right leadership style can increase job satisfaction and foster Organizational Citizenship Behavior (OCB) in pharmaceutical employees. This study aims to determine the effect of transformational leadership style on OCB mediated by job satisfaction. This type of research is a non-experimental descriptive study. The sample size in this study was determined using a total sampling method, resulting in 61 participants, comprising all employees of the Pharmacy Installation of Bahteramas Regional Hospital. The research instrument was a questionnaire using a likert scale, it was declared valid and reliable through convergent validity testing and analyzed using the SmartPLS 4 statistical test. The results of the study indicate that there is an influence of transformational leadership style on OCB with a p-value of 0.00 < 0.05 and a path coefficient of 0.625 indicating a strong relationship. There is an influence between transformational leadership style on job satisfaction with a p-value of 0.00 < 0.05 and a path coefficient of 0.910 indicating a very strong relationship and there is an influence between job satisfaction on OCB with a p-value of 0.00 < 0.05 and a path coefficient of 0.372 indicating a moderate relationship. The results of this study indicate that there is an influence of transformational leadership style on OCB through job satisfaction in the form of partial mediation as indicated by the confidence interval (CI) value not exceeding 0, namely 0.188 to 0.486. Based on the results of the study, it can be concluded that there is an influence between transformational leadership style and Organizational Citizenship Behavior (OCB) through the mediating variable of job satisfaction in all employees of the Bahteramas Regional Hospital Pharmacy Installation
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