As recent events attest, sexual harassment is an important yet misunderstood problem. Because it has only recently been recognized as a significant issue, research on sexual harassment is somewhat limited. Knowledge of the prevalence and effects on sexual harassment on campus is necessary to ensure that all people have access to a safe and non-threatening environment in which to learn and work. This study assessed the prevalence and definitions of, attitudes toward, and responses to sexual harassment among 4,011 male and female students, faculty, and staff on a university campus. Females and undergraduates reported the highest rates of sexual harassment. The most common responses to harassment were to ignore the behavior and to avoid the perpetrator. Common effects of harassment included interference with performance, inability to concentrate, and various negative emotions. Females defined more behaviors as harassing and had more sympathetic attitudes toward harassment than males. Undergraduates viewed fewer behaviors as harassing and graduate students had the most sympathetic attitudes toward harassment. Further research is needed on the reasons why many victims choose not to move beyond documenting the prevalence and effects of harassment to developing, implementing, and evaluating interventions that can make campuses safer environments in which to learn and work. (ABL)