Abstract: Introduction: Servant leadership is not only a tool for management but it’s an inner feeling of a person to serve others in best way. At the same time the association between servant leadership and organizational citizenship behavior has been recognized, the single-level channels underlying this connection and its limited conditions exist poorly understood. In this study, we inquire the mediating mechanisms of servant leadership and organizational citizenship behaviour in explaining the procedure by which servant leaders elicit discretionary Organizational citizenship behavior among followers. We also examine the role of followers’ proactive personality in moderating the indirect consequence of servant leadership and Organizational citizenship behaviour.