Child soldiers remain poorly understood and inadequately protected, despite significant media attention and many policy initiatives. This Research Handbook aims to redress this troubling gap. It offers a reflective, fresh and nuanced review of the complex issue of child soldiering. The Handbook brings together scholars from six continents, diverse experiences, and a broad range of disciplines. Along the way, it unpacks the life-cycle of youth and militarization: from recruitment to demobilization to return to civilian life. The overarching aim of the Handbook is to render the invisible visible - the contributions map the unmapped and chart new directions. Challenging prevailing assumptions and conceptions, the Research Handbook on Child Soldiers focuses on adversity but also capacity: emphasising the resilience, humanity, and potentiality of children affected (rather than 'afflicted') by armed conflict.