Introduction: Nowadays the concept of Organizational Citizenship Behavior (OCB) has attracted managers and researcher’s attention. Considering such behaviors that has not been much emphasized one way to increase organizational effectiveness. The aim of this study was to assess the relationship between OCB with its four dimensions on staff empowerment.

Methods: This is an applied-descriptive study, carried out in 2010.The study Population are 162 staffs in TUMS health centers. Data are collected using Padsakoof model questionnaire, and analyzed using the SPSS software, and ι, and Friedman test and Spearman coefficient.

 Results: In TUMS health centers among OCB dimensions altruism, conscientiousness and sportsmanship dimensions were in an appropriate level, but civic virtue dimension was in a lowest level than appropriate level. Conscientiousness dimension was in the highest level. There is significant correlation between OCB and staff empowerment. (P=0.00, r=0.628).

Discussion: Paying attention to the OCB concept and its establishment in organizations, and its significant relationship with staff empowerment, may be useful to grow up for human resources.