Over the past several decades, an increasing number of youth have been incarcerated for violent offenses. Existing interventions for serious offenders target the prevention of subsequent delinquent behavior in general, rather than the prevention of violent behavior in specific. Within the context of a randomized clinical trial of 79 adolescent males involved in the juvenile justice system, we examine the ability of treatment foster care of Oregon (TFCO) to prevent subsequent violent offending relative to services-as-usual group home care (GC). Data on offending were collected every 6 months for a 2-year period following entry into the study. The method of generalized estimating equations (GEE) was used to analyze the data. Results indicate that TFCO youth were significantly less likely to commit violent offenses than youth placed in services as usual group care. The group effect held even after control variables, including age at placement, age at first arrest, official and self-reported prior offenses, and time since baseline were introduced into the model. Twenty four percent of GC youth had 2 or more criminal referrals for violent offenses in the 2 years following baseline versus only 5% of TFCO youth. The rates of self-reported violent offending for TFCO youth were in the normative range following baseline, while rates for GC youth were 4 to 9 times higher. TFCO youth were also significantly less likely to report incidents of common violence such as hitting.