Sexual harassment has undoubtedly been a problem in organizations since they existed, but it was only 30 years ago that it began to be publicly recognized as a problem in need of intervention. In this chapter, we review the phenomenon of sexual harassment, beginning with its definition, the different forms it may take, means of measurement, and evidence about its prevalence and consequences. We then consider how sexual harassment might best be prevented and handled in organizations, basing our analysis on theory and research that inform our understanding of its causes. At the end of the chapter, we discuss what we consider to be the most promising directions for future research and practice on sexual harassment.Our review of sexual harassment is necessarily limited to what the empirical evidence offers to date. This evidence often lags behind theoretical and legal treatments of the construct. As an example, most sexual harassment research focuses on unwanted sexual behavior from men toward women; we now know that sexual harassment often takes same-sex and nonsexual forms. As another example, most antecedents and consequences studied are at the individual level; scholars now recognize the importance of group and organizational contributions to, and outcomes of, sexual harassment. The prevalence statistics we cite, the consequences we review, and the existing interventions adhere to a more limited understanding of sexual harassment and its causes and effects than is available to us now.