In today's changing and developing conditions, the role of school principals in education has increased significantly. Managers must also use their own leadership qualities while fulfilling these roles. In the research, managers' qualifications related to leadership and their opinions were tried to be examined. The purpose of the research in this context is to determine the opinions of secondary school principals on leadership competencies. Phenomenology, one of the qualitative research methods, was used in the study. In this direction, data were tried to be obtained with the help of interview questions at the point of determining the leadership competencies of secondary school principals. As a result of the research, leading and guiding, decision-maker and practitioner, having fair and communicative skills, participatory and effective in relation to the environment, strong legislative power, and persuasiveness. In addition, middle school administrators say that managers do not develop themselves enough, managerial duties are not carried out by competent persons, and managerial appointments must be made with a written examination. Secondary school principals also think that to contribute to the development of leadership competencies of managers, the in-service training activities should be organized, and the school principals should participate in the planning stages of these activities.