This chapter introduces the Handbook of Positive Youth Development (PYD) aiming to advance PYD scholarship among youth and emerging adults from a global international perspective. Noteworthy highlights regard (1) advancement of the theoretical and empirical knowledge base on PYD in global contexts; (2) refinement of methodological issues and measurement in under researched contexts; (3) integration of PYD scholarship with relevant research, policy, and practice. A prominent theme is the advent of a new generation of PYD scholarship in underrepresented global contexts and vast geographic regions (e.g., Africa, Asia, Australia, Europe, Middle East, New Zealand, North and Latin America). The handbook is composed by Part I PYD in Global Contexts and Part II PYD Applications and Interventions with a total of 37 chapters across 38 countries. Several chapters have an original empirical basis and involve in total, responses and voices from 22,083 youth and emerging adults in diverse parts of the world. With unique contributions, large samples and global approaches to research, policy and practice, this volume presents the most comprehensive and inclusive collection of empirical evidence on PYD among youth and emerging adults yet assembled. The outstanding cast of contributors clearly documents stellar accomplishments in the current PYD field, while providing creative and promising avenues about where future outlook and initiatives would be most fruitfully and effectively implemented.