The purpose of this paper aims to clarify the relationship between servant leadership and organizational trust, and tries to demonstrate the mediator role of leader trust and organizational communication in this relationship. The study sample included 258 employees of Guilan province Tax Administration and for sampling we used cluster method. Previous studies have also focused on the positive impact of servant leadership in organizational trust and in this article the results show that there is a significant relationship between servant leadership, organizational trust, leader trust and organizational communication.