This report presents information on young people aged 10–17 who were both in the child protection system and under youth justice supervision in 2014–15; it demonstrates the insights that can be gained through data linkage. Two (2) in 5 (40.8%) young people in youth justice detention in 2014–15 were also in the child protection system that year. Those who were younger at their first youth justice supervision were more likely to also be in child protection.