The World Congress on Justice for Children took place on May 28-30, 2018 in Paris, France. Three major issues were addressed in the Congress: the global trend towards children’s involvement in violent extremism and possible responses, the need for more effective ways to reduce juvenile offending and recidivism, and how to improve protection mechanisms for vulnerable children, including early prevention. Numerous professionals and stakeholders from all around the world shared their perspectives on youth and family justice, and the prevention of offending and violent extremism. Professor Manfred Nowak was a speaker on the keynote panel, many members of the NGO Panel were speakers and facilitators on different panels and workshops, and various activities and meetings were held in relation with the UN Global Study. Professor Nowak held a briefing session with state representatives on the Study and responding to the Questionnaire. He also met with the NGO Panel to discuss NGO engagement with the Global Study and to respond to questions directly from the Panel.