Sexual harassment (SH) is increasingly reported as an issue of major concern among both students and staff on campuses across the globe, and has been confirmed to have social and psychological consequences on the victim. However, the scale of the menace is underplayed because of under-reporting of cases. As a way to containing and/or regulating the behaviour, it is therefore imperative to obtain credible evidence on the veracity, the different forms, and how they play out to affect student victims with a view to foster an equitable campus climate. Thus, against the magnitude of the anecdotal reports on SH and the absence of empirical evidence on its extent, this study is concerned with obtaining baseline data on the forms and prevalence of campus-based sexual harassment, as well as ascertaining the awareness and knowledge of SH among undergraduates in a Nigeria University (OOU). An exploratory study involving cross-sectional survey of 1420 males and females was undertaken cutting across the faculties and levels in the University. The findings confirmed the existence of sexual harassment in OOU campus, though reported not to be on a rampant scale. Also, the behavior elements that indicate features of a hostile-environment harassment were reported with most likely occurrence on the campus. The policy implications of the findings were highlighted and recommendations made towards the prevention of SH victimization on the University campus.