The present study aims to extend and integrate previous research on the mediating effects of trust in supervisor and job satisfaction on the relationship between transformational leadership style and organizational citizenship behavior (OCB). Drawing on previous research, we argue that transformational leadership impacts OCB directly and indirectly via employees' trust in supervisor and job satisfaction. Our sample comprised of 211 Arab male and female teachers in the Arab education system in Israel. The results of structural equation modeling indicated a direct effect between transformational leadership and OCB, and an indirect effect of job satisfaction on the relationship between transformational leadership and OCB. However, trust in supervisor did not mediate the effect between transformational leadership and OCB. Implications and directions for future research are discussed.