This study evaluated the efficacy of a web-based personalized normative feedback program targeting heavy drinking in first year intercollegiate athletes. The program was offered through the Athletic Department first year seminar at a NCAA Division I university. Athletes were randomly assigned to either a web-based feedback group or a comparison condition. Results indicated high-risk athletes receiving the intervention reported significantly greater reductions in heavy drinking than those in the comparison group. Additionally, intervention effects were mediated by changes in perceptions of peer drinking. Findings support the use of web-based normative feedback for reducing heavy drinking in first year intercollegiate athletes.