Within the current fast-changing organizations the importance of developing a strong leader identity has been increasing steadily. Organizations invest a lot of money and resources into development programs of their leaders. However, there exists only limited evidence about the influence of leadership trainings on the development of the leader identity. In fact, plenty of research about transfer of training exists, but there is only limited evidence about the connection to leader identity development. Therefore, this master thesis examines how the transfer of training knowledge can influence the leader identity development after leadership trainings. The selected qualitative research indicates a positive influence of the leadership training on the identity development, especially in connection with triggered reflection and self-analysis. The results show the high potential of leadership trainings if they aim to develop leader identities.