This Handbook explores both established and emerging developments in experimental development economics. It reviews recent developments and conventions of the experimental tools of research and highlights key topics of ongoing scholarly interest such as the measurement of social preferences in developing countries, the impact of vocational and apprenticeship training programs, and novel measures of learning outcomes. Chapters present findings from developing countries, grouped under themes such as Preferences, Gender and Discrimination, and Human Capital Formation. The chapters offer insights into areas like dishonest preferences, role model effects as behavioral interventions, and the economic consequences of domestic violence. The Handbook also features thoughtful analysis of lab-in-the-field experimental approaches in developing country contexts, concluding with reflections by leading scholars on core methodological questions in the design of experiments for development research.