In this postgraduate specialist thesis, leadership styles and change management have been studied, through theoretical and empirical research. Leadership, as well as management change, have been in the focus of scientific researchs for many years. Due to the possibility of empirical verification and comparison with earlier research, the focus was placed on transformational and transactional leadership. Since leadership is related to followers who are active actors in the process of change, the aim of this research is to investigate, analyze and systematize theoretical knowledges about leadership styles and the their impact on the management of changes in organizations, identify the factors of changes that are influenced by leadership style, investigate the influence of leadership style on the type of changes, investigate the influence of leadership style on the way of implementation of changes, investigate the influence of leadership style on the level of understanding needs for changes, based on desk and empirical research and describe the results of the researches and give recommendations for further work in this area. For the purposes of the research, mostly foreign literature was used. One basic hypothesis and three auxiliary hypotheses are set in the paper. The survey was conducted in two organisations, on 73 questionnaries. Statistical program SPSS was used as a computerized data processing tool. The obtained results confirmed the hypotheses set. The conclusion of this research is that leadership style impact management changes, which has scientific significance, as well as implications for leaders. Some proposals are offered to improve leadership and management of changes.