In many cities of the world, integrating a growing population of young people, some of whom have left the countryside or another country in search of a better future, is a serious challenge. In other cities and neighbourhoods, the challenge is rather to retain youth by offering them jobs, housing and attractive and affordable services. In all cases, cities that have involved young people in governance and development structures will benefit from their energy and ideas to move the city toward economic, social, cultural, and environmental progress.