investigating the relationship between transformational leadership and organizational citizenship behavior considering the mediator role of empowerment

human resources in each organization are the most valuable assets and they play a decisive role in effectiveness of that organization. managers always strive to optimize the utilization of these resources. on the other hand, without willingness of employees to cooperate voluntarily and spontaneously with the organization, it would not be possible to increase effectiveness and improve its performance. the purpose of this study is to examine the relationship between transformational leadership and organizational citizenship behavior considering the role of intervening variable (empowerment of employees) in bandar imam khomeini's petrochemical company. research data was gathered from a simple sample of 158 people with questionnaires. the obtained results indicated that all the scales of questionnaires were considered to be reliable (cronbach's alpha), the reliability of which was confirmed through reviewing previous researches as well as interviewing with researchers and scientists. the results of study showed that there is a significant positive relationship between transformational leadership and employee’s psychological and structural empowerment and organizational citizenship behaviors. also, the effects of mediator variable on the relationship between transformational leadership and organizational citizenship behavior were shown to be significant.