The study examines the effects of personal factors (gender, marital status, education and seniority) and intra-organizational factors (transformational leadership, job satisfaction and trust in supervisor) on Organizational Citizenship Behavior (OCB) in the Arab education system in Israel. This is a quantitative study, based on questionnaires given to 211 teachers in the Arab education system in Israel. The results show a positive relationship between gender and OCB. A positive relationship was found between all intra-organizational factors and OCB. In addition, it was found that intra-organizational factors contribute more to explain OCB than personal factors do. Implications and directions for future research are discussed.