The study evaluates the perceived effectiveness of the leadership styles of deans in Ethiopian governmental Technical and Vocational Education and Training (TVET) colleges. The study was contextualised within the domain of relevant leadership theory in chapter 2 (with specific emphasis on the Full Range Leadership model developed by Bass and Avolio), and within the field of Technical and Vocational Education and Training in chapter 3. A mixed method research methodology was employed in the empirical research. The quantitative part received the most emphasis, while a qualitative part was added to attempt to corroborate findings. Quantitative data were collected from teachers (219), student council members (65) and deans (10) in ten TVET colleges using the MLQ 5x short-form questionnaire, which is a standardised questionnaire of high repute. The quantitatively collected data were analysed and presented using both descriptive and inferential statistics. The qualitative part consisted of semi-structured interviews conducted with the ten deans and one TVET Bureau Head. Quantitative findings indicated that the transformational and transactional leadership styles were observed far more frequently than the laissez-faire style. Perceptions regarding the effectiveness of deans, teachers’ job satisfaction and teachers’ willingness to make an extra effort were positively and statistically significantly influenced by the presence of both the transformational and the transactional leadership styles and to a slight extent, influenced negatively by the interaction effect of the two styles. Qualitative findings mostly corroborated the quantitative findings. Recommendations emanating from the research inter alia include: Leadership training opportunities for TVET deans should be scheduled to enhance the appropriate leadership style practice of deans (especially the transformational style); resources (human, financial and materials) should be made available to TVET colleges to develop desired types of leadership in colleges; as part of the selection process when appointing new TVET deans, the leadership style/s that applicants use at that stage should be assessed; a staff-dean-team-approach will be productive if the dean practises a transformational-orientated style of leadership. / Educational Leadership and Management / D. Ed. (Educational Management)