This experiment aimed to find out the impact of transformational and transactional leadership style on Organizational Citizenship Behavior. The sample consisted of 57 workers that answered some statements which analyzed using PLS. Research shows transformational and transactional leadership style influence positively and significantly against Organizational Citizenship Behavior in achieving organizational goals. Transformational leadership style found to be dominant on Organizational Citizenship Behavior than transactional leadership style. So it concluded that transformational leadership style considered to be able to lead the employees and as trigger action exceeds the employees\u27s duties