The purpose of the study is to explore the effect of school principals’ distributed leadership behaviours on teachers’ organizational commitment in the views of teachers employed in high schools. The study is a descriptive research designed as a correlational survey model and the research population consists of teachers in high schools in the provincial centre of Diyarbakır, a large city in south-eastern Turkey. The study is conducted with 275 teachers, selected by simple random selecting method. In the research, conducted in the views of high school teachers, descriptive statistics are employed to determine the distributed leadership behaviours of the participant principals and the teachers’ organizational commitment levels and a regression analysis is used to predict the participant teachers’ organizational commitment arising from the distributed leadership behaviours of the school principals. As a result of the study, the distributed leadership behaviours of the school principals are found at a high level in the following factors: open leadership, school culture, employee involvement and dynamics, whereas the teachers’ organizational commitment levels are found low in the compliance factor but as for identification and internalisation factors, they are found high. Moreover, it is determined that teachers’ organizational commitment can be statistically predicted from school principals’ distributed leadership behaviours.