The purpose of this research is to study the effect of leadership, organizational support and organizational citizenship behavior on service quality of the Chairman of the study program at the State University of Jakarta. This research used a quantitative approach with a survey method. The research population was Chairmen of the study program of Universities Jakarta. The research sample was 64 Chairmen of the study program selected randomly. Data were obtained from questionnaires and, then, analyzed using descriptive statistics, path analysis and inferential statistics. These results indicate that the Leadership has a direct positive effect on Service Quality, Organizational Support has a direct positive effect on Service Quality, Organizational Citizenship Behavior (OCB) has a direct positive effect on Service Quality, Leadership has a direct positive effect on Organizational Citizenship Behavior (OCB), Organizational Support has a direct positive effect on Organizational Citizenship Behavior (OCB) and the Leadership has a direct positive effect on Organizational Support. Thus, to improve the service quality, the Leadership, as well as the Organizational Support and OCB, should be improved.