This report presents information on the youth detention population in Australia from June 2016 to June 2020. Among the 798 young people in detention on an average night in the June quarter 2020, most were male (91%), aged 10–17 (80%), unsentenced (64%), and non-Indigenous (52%). Over the 4-year period, the number of young people in detention fluctuated across quarters though fell overall from 922 in the June quarter 2016.