|The purpose of this study is to determine the effect of perceived supervisor and coworker support on organizational citizenship behavior. The study sample consists of 325 employees working in İzmir Provincial Health Directorate. The survey technique, one of the quantitative research methods, was used in the study. According to the analysis results, it was determined that there is a significant and moderately positive relationship between perceived supervisor support and organizational citizenship behavior. It was concluded that there was a significant and moderately positive relationship between perceived coworker support and organizational citizenship behavior. The concepts of perceived supervisor support, coworker support, and organizational citizenship behavior constitute an important field of study in the literature. A limited number of studies have been found dealing with the relationship between supervisor and coworker perceived during the literature review and organizational citizenship behavior. This study is thought to be important due to its contributions to the literature and the organizations.