The focus of this study was to investigate the effect of head teachers’ laissez faire leadership styles on teachers’ professionalism in public secondary schools in Temeke Municipality with the following specific objectives. First, to find out relationship between laissez-faire leadership style and teachers’ performances in public secondary schools. Second, to evaluate the impact of laissez faire leadership style on teaching and learning process in public secondary schools and thirdly, to assess the influence of laissez-faire leadership style towards teachers’ attitude in public secondary schools.

The sample size of the study was 80 respondents. 77 secondary school teachers were involved in the quantitative part of the study. On the other hand, 3 school heads from three selected Secondary Schools were involved in the qualitative phase of the study. This research applied mixed approach and a case study survey design was employed. The questionnaire was used to collect data from teachers while interview guide was applied to obtain data from the head teachers.

Quantitative analysis was done using Statistical Package for Social Sciences (SPSS) and presented using frequency distribution tables while qualitative data was analyzed thematic. The study concluded that, there is a negative significant relationship between head teachers’ laissez faire and teachers ‘professionalism. The researcher recommended that success of an organization is reliant on the leader’s ability to optimize human resources. Thus a good leader should understand the importance of employees in achieving the goals of the organization.