One of the most important factors affecting organizational commitment of the teacher, the principal, as an effective instructional leader, should work hard to increase the organizational commitment of the personnel for the school to achieve its goals. As can be revealed by the research, teachers with higher organizational commitment are more sacrificing and successful in their works and thus, share very important duties and responsibilities for the construction of effective schools. When the national studies focusing on the organizational leadership of principals are examined, it is observed that while there are many studies dealing with the organizational leadership in relation to different variables, the amount of research focusing on organizational leadership together with organizational commitment is quite limited (Yüce, 2010; Serin, 2011), and majority of these few studies were conducted at elementary level. Given that there is no study looking at the relationship between instructional leadership and organizational commitment and there are important differences between elementary school organizations and secondary school organizations, it seems to be clear that a study to be conducted on the relationship between instructional leadership and teachers’ organizational commitment at secondary education level will make important contributions to the literature.