This article examines the incidence of an omnipresent but underreported crime intransit environments: sexual harassment. More specifically, it presents the findingsof a global comparative study that surveyed 11,710 college students from 18 cities insix different continents, to inquire about their victimization experiences with verbal,physical, and non-verbal/non-physical sexual harassment in transit environments.The study finds that sexual harassment is a common occurrence in all cities but how,where, and to what extent it happens is quite specific to the particular socio-spatialcontexts. Certain individual characteristics of students and environmental characteristicsof the transit setting can increase the risk of harassment. Different typesof sexual harassment are more likely to happen in certain transit settings than others.While female students are disproportionately affected, some male students alsoreport experiences of victimization. The study concludes with a discussion of multiprongedresponses to harassment.