In the last few years, impressive research has been done on disorders of sex development (DSD), largely expanding the physiopathology with relevant effects on practice. Thus, management of individuals with DSD requires updated scientific knowledge, integrating basic and clinical information. In addition, doctors involved in the care of individuals with DSD need to develop specific personal skills in communication, ethics, legal issues and the ability to work together in dedicated multidisciplinary teams. National or even international networks are also mandatory to create stringent structures for correctly addressing the care of individuals with DSD and to offer them a better long-term outcome. This special issue of Sexual Development covers several of these hot topics and highlights some aspects of research and management. A special paper from a patient support group has been enclosed to present the opinion of affected people. All the authors have been selected regarding their expertise and documented competencies. This volume is essential reading for all scientists and clinicians involved in the field of DSD to plan additional research and to optimize the care of their patients.