This research brief examines racial and ethnic disparities in the Illinois juvenile justice system across five critical decision points: arrest, diversion, detention, secure confinement, and transfer to adult court. Using 2022 data from various state agencies to create a disproportionality index, we found overrepresentation of Black youth at all decision points and Latinx youth at three points. We used disparity ratios to compare the involvement rates of different racial and ethnic groups relative to those of White youth. These findings highlight the need for further research and interventions to address systemic factors, including discretionary decision-making and broader societal inequities.