Individuals with attention-deficit/hyperactivity disorder (ADHD) are more likely to engage in risky behavior across the lifespan than those without ADHD. College represents an important developmental phase during which the initiation and escalation of heavy drinking set the stage for lifelong difficulties with alcohol and other drugs (Maggs, 1997). The present study examined patterns of alcohol use, illicit drug use, risky sexual behavior, and risky driving behaviors among 39 college students with ADHD and 60 college students without ADHD. Results suggested that among college students, ADHD, CD, and their comorbidity were differentially associated with patterns of risky behavior. Results from the present study largely support the overarching view that individuals with ADHD engage in higher rates of risky behavior; however, specific findings were at times inconsistent with the existing literature on young adults with ADHD. Further research is needed to examine moderators of the association between ADHD and risky behavior.