The leadership behaviours that can lead to the development and maintenance of a successful school unit determine the leadership style. The purpose of this research was to examine the perceptions of public secondary school teachers of the Prefecture of Thessaloniki in Greece concerning their principals' leadership style, the results of leadership, whether they are influenced by demographic and work characteristics, the correlation of leadership style with leadership outcomes and if a leadership style constitutes a predictor of leadership outcomes. The findings of the research are reported regarding the style perceived by the public secondary education teachers of the Prefecture of Thessaloniki in Greece and the results of the leadership of the principal of the school unit where they work, as well as whether they are influenced by demographic and occupational characteristics