This report details a project undertaken by the Australian Institute of Health and Welfare on behalf of the Australasian Juvenile Justice Administrators and the National Community Services Information Management Group, to develop a National Minimum Data Set for juvenile justice. It provides a description of the methodology used to develop the NMDS, a detailed flow chart of the juvenile justice system in the broad context, a data model and a draft data dictionary for the Juvenile Justice National Minimum Data Set Version 1.0. This report and the data dictionary contained within the report are an initial stage in the process of moving toward a national data collection on juvenile justice. A number of recommendations on the further steps required to achieve a national collection are also detailed in this report.