This paper presents an empirical investigation to study the roles of emotional intelligence (EI) and job satisfaction (JS) on employees’ organizational citizenship behavior (OCB). The study is performed among 140 randomly selected employees who worked for an Iranian bank in province of Karaj in 2014. The study uses the questionnaire developed by Organ (1998) [Organ, D. (1988). Organizational citizenship behavior: The good soldier syndrome. Lexington, MA: Lexington Books.] to measure organizational citizenship behavior (OCB). To measure emotional intelligence, Cyberia Shrink emotional intelligence quiz is employed. Finally, to measure job satisfaction, a revised version of the questionnaire introduced by Smith et al. (1969) [Smith, P. C. , Kendall, L. M., & Hulin, C. L. (1969). The Measurement of Satisfaction in Work and Retirement. Chicago: Rand McNally.] is implemented. The results of Pearson correlation have indicated that there were some positive and meaningful relationships between EI as well as JS with OCB. In addition, the results of Stepwise regression have indicated that there were some positive and meaningful relationship between all components of EI, JS with OCB.