Cumhuriyet Üniversitesi Fen Fakültesi Fen Bilimleri Dergisi (CFD), Cilt:36, No: 6 Ozel Sayı (2015) ISSN: 1300-1949 Cumhuriyet University Faculty of Science Science Journal (CSJ), Vol. 36, No: 6 Special Issue (2015) ISSN: 1300-1949 _____________ * Corresponding author. Email address: Kamyab TAJASOB Special Issue: The Second National Conference on Applied Research in Science and Technology http://dergi.cumhuriyet.edu.tr/ojs/index.php/fenbilimleri ©2015 Faculty of Science, Cumhuriyet University The Relationship among Leadership style, Perceived Organizational Support, and Employees’ Job Performance in Iran Khodro Dissel Company Mohammadreza JOORSARA 1 , Kamyab TAJASOB 2 *, Sahar AHMADIAN 1 1 Department of Management, College of Humanities, Buinzahra Branch, Islamic Azad University, Buinzahra, Iran 2 Departments of Management, Takestan Branch, Islamic Azad University, Takestan, Iran Received: 01.02.2015; Accepted: 06.06.2015 ______________________________________________________________________________________________ Abstract. The present study aimed to examine the relationship between leadership style and employees’ job performance in Iran Khodro Dissel Company. In so doing, the role of the moderating variable of perceived organizational support has been evaluated with regard to the relationship between leadership style and employees’ job performance. The method was applied in terms of the objective and correlational-descriptive in terms of method and nature. Accordingly, the study population was composed of all employees in Iran Khodro Dissel Company with at least bachelor degree that using Cochran formula, 261 subjects were selected as the study sample through simple random sampling technique. For data collection, the standard questionnaires of Bass and Olive (1994) Multi-factor Leadership Questionnaire (MLQ) including transformational and transactional leadership styles, LaMastro (1999) perceived organizational support of employees and Paterson (1998) job performance were used. The collected data were analyzed using Lisrel and SPSS19 software. The results obtained from the study revealed that there is a significant relationship between leadership style and employee’s job performance in Iran Khodro Dissel Company. In addition, the results showed a significant relationship between perceived organizational support and job performance, transformational leadership style with perceived organizational support and job performance, and transactional leadership style with perceived organizational support and job performance. Also, the results of regression analysis approved the impact of moderating variable of perceived organizational support on the relationship between perceived leadership style and employees’ job performance in Iran Khodro Dissel Company. Keywords: Leadership Style, Perceived Organizational Support, Job Performance 1. INTRODUCTION Today, given the fundamental changes in organizations, the role of labor force in all areas has been recognized as important and human resources has been considered as one of the critical factors for the survival of organizations because it is the humans who make decisions and then implement. Thus, the most important and fundamental issue in any organization is the job performance of human resources because the survival and continuity of the activities of organizations and institutions are related to the efficiency and effectiveness of employees’ performance [ 1 ] . Performance has been defined as the expected overall value of the organization from the separated behavioral pieces that a person is doing within a specified period of time [ 2 ] , however, various studies have shown that level of performance in organizations is not satisfactory and the most problems of organizations also emerge from the same shortcomings. Hence, addressing factors affecting the improvement of employees’ job performance that finally leads to enhancing the productivity of organization is a very important issue out of issues related to organizational studies. However, studies show that leadership styles have many effects on ideas, values, and what employees do. Leadership styles are effective on how to manage employees. Leadership style is a suitable behavioral pattern applied in the process of the guidance of and influence on employees [ 3 ] . In fact, in work culture and according to the characteristics of people in the organization, the role of leadership and management can be effective in promoting and improving the level of productivity of people and organizations. The correct selection of a leadership style which is coordinated with the external stimulation can meet the needs of belonging, respect, dignity, improving performance, promoting employment and employees’ job satisfaction and ultimately lead to obtaining the individual and organizational qualification [ 4 ] .