This article reviews the relationship between social self concept, organizational identity and organizational citizenship behavior among employees in Tax Affairs Organization in Lorestan province. Thus, the most important aspects of organizational citizenship behavior was extracted from extensive study of library resources and articles and scientific magazines in internet sites and articles presented in the First Citizenship Behavior Management National Conference in Tehran university and then these resources were all reviewed. The population of the study consists of employees in Tax Affairs Organization in Lorestan province that was evaluated using questionnaire (social self concept, organizational identity and organizational citizenship behavior). Sample size was estimated 250 individuals using Cochran formula and simple random sampling. Research hypothesizes were tested using modeling statistical Structural equation modeling (SEM) and smartpls software. Results show that there is a significant relationship between organizational identity and organizational citizenship behavior among employees. Also there is a significant relationship between organizational citizenship behavior and organizational identity.