This research investigated the effect of leadership on organizational effectiveness in the public hospital. As a result of multi-regression analysis based on the data of 384 employees in 5 public hospitals in Korea, transformational leadership positively affected organizational commitment and job satisfaction. Transformational leadership had a significantly negative effect on turnover intention. Transactional leadership had a significantly positive relationship with organizational commitment and job satisfaction. This study has means that was first analysed relationship between the leadership style and organizational effectiveness of public hospital in Korea. The difference that demographic variables have on organizational commitment, job satisfaction, and turnover intention examined. Variables like gender and type of occupation have a significant difference.