There has been a great interest in terms of leadership and its effects in the organization. Apart from leadership style, organizational commitment is emphasized as another important factor that affects organizational performance. As employees are satisfied, they desire to stay with the organization and work for it willingly. In our study we expected to find out significant relationship through dependent variables (supervisory commitment and organizational performance), and independent variable as leadership styles in the case of transformational, transactional, and laissez-faire leadership in Turkey. Another goal of our study is to reveal the mediating effect of commitment to superior. It is noted that our study is based on a survey of 1019 people who work in companies in Turkey and analysis results represented that the mediating effects of leadership types on organizational performance. Further, we compared relationship between the factor analysis, reliability, correlations and regressions. Consequently, our hypotheses are supported and positively related.