This handbook addresses universal developmental and cultural factors contributing to child and adolescent mental health and well-being across the globe. It examines sociocultural contexts of development and identifies childrens and adolescents perspectives as critical to understanding and promoting their psychological well-being. It details the Promoting Psychological Well-Being Globally project methodology for data collection and analysis, provides cross-cultural analyses of its findings, and offers a practical model for clinicians and other professionals seeking to apply this knowledge to real-life settings. Featured topics include: Sexual health, gender roles, and psychological well-being in India. Psychological well-being as a new educational boundary in Italy. Mapping psychological well-being in Romania. Youth perspectives on contributing factors to psychological well-being in Sri Lanka. Culturally specific resilience and vulnerability in Tanzania. Longing for a balanced life – the voices of Chinese-American/immigrant youth in the United States. The International Handbook of Psychological Well-Being in Children and Adolescents: Bridging the Gaps Between Theory, Research, and Practice is an invaluable resources for researchers, clinicians, scientist-practitioners, and graduate students in child and school psychology, social work, public health, positive psychology, educational policy and politics, and maternal and child health.