This study reviewed and analyzed the impact of non-formal Human Rights Education and Training (HRET) programs, particularly those focused on and led by youth, in accordance with the emphasis on youth in the Plan of Action for the fourth phase of the United Nations World Programme for Human Rights Education. It is among the first human rights education studies to map the impacts of non-formal HRET programs. Quantitative and qualitative data relevant to the HRET criteria outlined by the Office of the United Nations High Commissioner for Human Rights were collected through evaluations and reports generated by NGOs and other HRET organizations, phone interviews with key informants such as NGO staff and independent researchers, and academic studies of NGO programs. Through analysis and synthesis of existing impact assessments as well as accompanying data and resources, this report identified key factors contributing to successful HRET programs in non-formal settings, highlights global trends with respect to HRET impact assessments, and made recommendations for future research.