Introduction: Regarding the educational goals of university and academic performance, it seems that organizational citizenship behavior (OCB) is one of the effective variables in increasing the educational performance of university faculty members. The present study aims to investigate the relationship between organizational citizenship behavior (OCB) and educational performance of the faculty members of Tabriz University of Medical Sciences in 2013-14. Methods: Researchers selected 127 faculty members and 1,120 students from different grades in order to investigate the relationship between altruism, conscientiousness, sportsmanship, civic virtue and respect and the educational performance of faculty members. Generalized estimating equations (GEE) were used in this method. Data were analyzed using SPSS 21 software and the significance level of 0.05. Results: There was a significant relationship between altruism and educational performance (P =0.043). There was a significant relationship between conscientiousness and educational performance (p=0.046). A significant relationship was observed between sportsmanship and educational performance (p=0.004). There was no significant relationship between civic virtue and educational performance (p=0.98). A significant relationship was observed between respect and educational performance (P>0.001). There was no relationship between citizenship behavior and gender of the faculty members (P> 0.05). Conclusion: The results of this study showed that the more faculty members have the spirit of cooperation and assistance to colleagues and students and try to understand the specific situations that students face, the more effective they are in increasing the educational performance at the university level.