The research explores the links between migration of adolescent girls and development in the Global South through a holistic approach that contextualises adolescents’ and young women’s agency, choices and migration experiences. More migrants move within their own region than migrate to North countries. This mixed-method and multi-sited research focuses on adolescent girls who migrate internally and internationally from Bangladesh, Ethiopia and Sudan. By considering different geographical realities, the research will explore variation in the impact adolescent girls’ migration has on their own lives, on their families and communities, and potentially on the social development of countries with different development scenarios. The research fills an existing gap in knowledge about the reasons adolescent girls migrate and their aspirations and experiences. It will provide insights into their agency and capacity to choose, their future opportunities, as well as constraints and how these are shaped contextually.The project will feed into the global campaign “Destination Unknown” recently launched by Terre des Hommes (TDH) who is a project partner. The research will contribute to global policy debates by producing policy relevant analysis, data and recommendations.