Purpose: The purpose of this study was to investigate the effect of family-centered interventions on improving health outcomes in children and adolescents with type 1 diabetes mellitus (T1DM). Methods: A literature search was conducted according to the PRISMA guidelines, using six electronic databases: EMBASE, CINAHL, Medline, CENTRAL, Scopus, and Web of Science. The inclusion criteria encompassed studies with populations of children and adolescents (age <18 years) and at least one parent/caregiver, or only parents/caregivers if the children were very young, and studies that investigated the health outcomes of children and parents/caregivers diagnosed with T1DM. Results: From 2,746 published studies, only nine studies met the inclusion criteria. The key interventions were non-technology-based interventions (n=4), technology-based interventions (n=2), and combined technology- and non-technologybased interventions (n=3). The interventions had effects on glycated hemoglobin, adherence to diabetes management, diabetes self-management behaviors, and parentchild teamwork in diabetes management. Other essential effects were children's quality of life, children's problem-solving skills, parents' quality of life, and parents' coping and depression. Conclusion Family-centered interventions can effectively improve health outcomes in children and adolescents with T1DM. In the future, family-centered interventions integrated with other approaches, theories, and models should be developed to achieve the best possible outcomes.