This study examined the influence of adolescent psychiatric disorder on young adult recidivism and compared findings with earlier studies of juvenile recidivism. Logistic regression analysis examined subsequent adulthood recidivism (through age 23 years) by disorder profile, adjusting for prior offense severity and background variables, in 340 Alabama juveniles referred to juvenile justice agencies (probation and detention). Youths with comorbid internalizing and disruptive behavior disorder had a sixfold increased risk for young adult recidivism compared with nondisordered counterparts. Comorbid internalizing disorder likely is a marker for the severity of a youth’s disruptive behavior disorder; similarly, offending that continues into adulthood likely betokens a more serious course of offending behavior. The severity underlying disorder and offending behavior is probably the common link between them. To prevent reoffending into adulthood, the mental health needs of juvenile justice youths’ internalizing and externalizing problems should be addressed.