Juveniles who come into contact with the justice system have been identified as a significant area of interest and concern to communities and government. In Australia, responsibility for juvenile justice rests with a number of different organizations in each State and Territory with most of the information regarding juveniles in the justice system being State-based. The only existing national data on juvenile justice in Australia is a collection on persons in juvenile detention centers, held and reported by the Australian Institute of Criminology (AIC). This report outlines a project undertaken by the Australian Institute of Health and Welfare (AIHW) for the Australian Juvenile Justice Administrators (AJJA) and the National Community Services Information Management Group (NCSIMG) to develop a national minimum data set (NMDS) for juvenile justice. The report presents a description of the methodology used to develop the NMDS, details of the scope, a detailed flow chart of the juvenile justice system, a data model and a draft data dictionary for the Juvenile Justice National Minimum Data Set (JJ NMDS) Version 1.0. The report is comprised of 5 major sections that include: (1) summaries of the 12 main recommendations and AJJA responses, (2) the project to develop a national minimum data set for juvenile justice, (3) description of the JJ NMDS Version 1.0, (4) JJ NMDS Dictionary Version 1.0, (5) and moving the JJ NMDS towards a national data collection. Appendices A-E and references