This research aims to find out the influence of organizational justice, ethical leadership and commitment to Organizational Citizenship Behavior (OCB). Research was done by using a sample of employees who work in the public universities in Daerah Istimewa Yogyakarta (DIY). The number of final participant who can be analyzed for this research as much as 205 participant, sampling techniques used is covenience sampling. Most participant work in academic administration as much as 123 participant (60%), consist of 14 (7%) librarians, 41 (20%) financial staff, 13 (6%) laboratory assistant, and 13 (6%) general affairs. Data collection method in these research using survey methods, with this method the respondents were asked to fill the questionnaire consisting of items from the statement of organizational justice, ethical leadership, commitment and OCB. Data analysis in this research using multiple regression analysis. This research findings shows that organizational justice, ethical leadership and commitment is predictors from OCB. The higher perceived organizational justice by the employees will be more high OCB this result is supported by the statistical results with Sig. 0,005, as well as with the existence of leaders who are able to apply the ethical behavior will promote OCB for his subordinates, this result supported with the statistical results with Sig. 0.003. The higher level of commitment will be more high OCB with the results of the Sig. 0,000. The practical implications of the research are to increase role and support from the leadership of the organization or management of universities to be willing to apply the ethical behavior, make an effort to increase the commitment by communicating and implementing organizational justice equally for all members of the organization.