A randomized control trial was conducted at a midsized private university in the Northeast to evaluate the short-term impact of AlcoholEdu for College 8.0, an online alcohol course for first-year students. In September 2007, 1,620 matriculated first-year students were randomly assigned to either a treatment group or an assessment-only control group. Both groups of students completed a baseline survey and knowledge test. Treatment group students finished the course, took a second knowledge test, and 30 days later completed a postintervention survey. Control group students completed the postintervention survey and knowledge test during the same time period. Compared with the control group, treatment group students reported a significantly lower level of alcohol use, fewer negative drinking consequences, and less positive alcohol-related attitudes. AlcoholEdu 8.0 had a positive impact on the first-year students' alcohol-related attitudes, behaviors, and consequences. Additional investigations of online alcohol education courses are warranted.