We will create safer urban environments with and for young people, with the aim of ultimately impacting the personal, societal and environmental drivers that together promote wellbeing to achieve a two-fold impact: that the environment itself is safer for young people (objective) but also that young people themselves feel safer in their environments (subjective). Initially in 2 cities in 2 years then scaling up to 10 cities over 10 years, we will engage with city authorities, private sector and young people to understand the priority safety concerns and their predeterminants. Based on this, we will select tactical areas for intervention, and frame innovation challenges around them. We will do capacity building based on gap analysis to facilitate improvements and use these innovations as examples to generate larger changes in urban policy, practice and resource allocation. In parallel, we will convene a global learning network to trigger overflow changes in the global community.