The psychosocial well-being of migrant children has become an urgent issue facing many Western countries as the number of migrant children in the population increases rapidly and health-care systems struggle to support them. Often, these children arrive with extensive exposure to trauma and loss before facing additional stressors in the host country. Yet, these children do not access mental health support even when available due to multiple barriers. These barriers include cultural and linguistic barriers, the primacy of resettlement needs, and the stigma attached to mental health illness. In order to improve mental health services for migrant children, there is a need to move away from focusing on trauma and mental health symptoms and to look instead at migrant children’s well-being across multiple domains, including activities that can promote or diminish psychological well-being. Trauma Systems Therapy for Refugees (TST-R) is an example of an approach that has succeeded in overcoming these barriers by adopting a culturally relevant and comprehensive approach to mental health care.