This research examines the impact of formal and informal labeling on self-reported violent and non-violent delinquency. This longitudinal research design utilizes cohort 15 from the Project on Human Development in Chicago Neighborhoods (PHDCN) at two different points in time. This research not only evaluates the effect of formal labeling (arrest) but also determines the effect of informal labeling (warning and releasing) by police officers. Specifically, the hypotheses assess if labeling affects minority youth differently than white youth. Using nested ordinary least square re and logistic regression models, the results indicate that labeling only operates in simple models containing few variables. The apparent effects of labeling on non-violent delinquency are accounted for in the complete model by previous delinquent behavior, living in a two-parented home, and having a parent with a criminal record. Moreover, the apparent effects of labeling are diminished in the complete model predicting violent delinquency once controlling for the effects of race (Black), gender (male), lower income level, and having a parent with a criminal record.