Organizational citizenship behavior is sort of ethical behavior, which is considered as an inevitable necessity for effective organizational performance. The aim of this study was to investigate the impact of ethics on reinforcing organizational citizenship behavior. The study is an applied research adopting a survey design. The statistical population included 300 managers of arts and cultural clubs of the mosques in Esfahan in 2014-15. As statistical sample, 150 managers were selected by means of Cochran’s formula. The data collection tool was a researcher-made questionnaire (Cronbach’s Alpha= 0.83). The content validity of questionnaire was confirmed by experts and professors. The results indicated that from the viewpoint of respondents, the impact of organizational ethics on citizenship behavior is above average. Therefore, according to the results of statistical analyses, all the hypotheses of this research are confirmed and paying attention to ethical issues can improve the performance of the organization. Moreover, organizations’ adherence to ethics has a positive impact on different dimensions of organizational citizenship behavior.