Juvenile justice in Australia 2004-05 provides data from the Juvenile Justice national minimum data set (NMDS), developed by the Australian Institute of Health and Welfare (AIHW) and the Australasian Juvenile Justice Administrators (AJJA). The Juvenile Justice NMDS includes information on all young people in juvenile justice supervision in Australia, both in the community and in detention. It is based on the experience of the young person within supervision, making it somewhat different to other criminal justice collections that focus on legal orders. This is the second report on the collection and presents data for 2004-05, as well as analyses of trends in community-based supervision and detention over the five years since 2000-01. It includes data on the characteristics of the young people under supervision such as age, sex and Indigenous status, and their patterns of supervision.