Job satisfaction, as an integral part of organizational environment, can affect organizational citizenship behavior. Therefore, the present paper aimed at determination of the relationship between these two factors among the employees to provide an appropriate model. The population of this study consisted of all employees of Golestan Province industry, mine and trade organization (Iran), the number of whom is 154, out of which, 120 employees were selected as a sample by the simple random sampling method. For collecting the data, two questionnaires of job satisfaction and organizational citizenship behavior were applied, and the obtained data was analyzed using the statistical methods of Kolmogorov-Smirnov test, Spearman's correlation, Pearson's correlation coefficient, Regression analysis, F-test and T-test. From the results, it was found that the variable of job satisfaction had a significant positive relationship with organizational citizenship behavior and one unit increase in organizational citizenship behavior is resulted from 0.622 unit increase in job satisfaction.