ABSTRACT. The aim of this study is to find out leadership behaviours of secondary school teachers in the classroom. For this purpose, 300 secondary school teachers were asked to complete Integrated Competing Values Framework (ICVF) questionnaire in order for us to explain leadership behaviour in this context. Repeated measures ANOVA and multiple regression analysis techniques were used in analysing the data. Multiple regression analysis revealed that the Deliverer, Developer and Broker were the strongest predictors of effectiveness. Furthermore, according to the results there was no gender differences found in the roles displayed. All six operational roles of the ICVF -Deliverer, Developer, Innovator, Broker, Monitor and Integrator-were displayed, with the Deliverer displayed significantly more than the Monitor.