This book is the product of an institutional research project and looks towards making a contribution to those who work in the organizational field. Both organizational change and engagement are important variables in organizations because they are part of a mechanism and, as such, can affect the development and growth of the organization. This book, which addresses various aspects that contribute to give an extensive approach to the topics, allows us to observe how these variables are related to each other. In this way, it starts from the management of human talent in organizations and how positive psychology can be framed in the organizational field. Therefore, what is the role of organizational change, and finally the relationship between the variables under study is presented from the perspective of positive psychology.