This handbook examines positive youth development (PYD) in youth and emerging adults from an international perspective. It focuses on large and underrepresented cultural groups across six continents within a strengths-based conception of adolescence that considers all youth as having assets. The volume explores the ways in which developmental assets, when effectively harnessed, empower youth to transition into a productive and resourceful adulthood. The book focuses on PYD across vast geographical regions, including Europe, Asia, Africa, Middle East, Australia, New Zealand, North America, and Latin America as well as on strengths and resources for optimal well-being. The handbook addresses the positive development of young people across various cultural contexts to advance research, policy, and practice and inform interventions that foster continued thriving and reduce the chances of compromised youth development. It presents theoretical perspectives and supporting empirical findings to promote a more comprehensive understanding of PYD from an integrated, multidisciplinary, and multinational perspective.