Up to 16% of students have suffered an unwanted sexual experience at college or university, a study found.
One in 10 women and 5% of men also reported being the victim of obsessive behaviour that made them afraid or concerned for their safety while studying.
In the first study of its kind, s tudents' experiences of harassment, stalking, violence and sexual assault were uncovered by the Union of Students in Ireland (USI).
Laura Harmon, USI vice-president for equality and citizenship, said she hoped the results of Say Something will inform national campaigns in the future and raise awareness of supports available.
"The victim is never to blame," she said.
"USI hopes that this study will help to open up dialogue around these issues among the student body."
The study was the first of its kind and scale in Ireland with 2,750 students - of mixed gender and sexuality - responding between January 10 and February 15 this year.
:: 16% experienced some form of unwanted sexual experience at their current third level institution, with the figure rising to one in five for women.
:: just 3% of those reported it to gardai.
:: acquaintances were identified as the perpetrators by most victims.
:: 11% of women were victims of unwanted sexual contact, and three out of 10 experienced comments with a sexual overtone that made them feel uncomfortable.
:: over 10% of men and 8% of women have had photographs or videos circulated online without their consent.
:: lesbian, gay bisexual and transgender (LGBT) students accounted for just 14.72% of respondents, but were more likely to have been the victims of physical violence, obsessive behaviour, or unwanted sexual experiences.
Supported by Cosc - the National office for the prevention of Domestic, Sexual and Gender-based Violence - USI will launch the Say Something report at Trinity College later.
Greg Heylin, director of Cosc, said: "This is the first time that a study of this type and magnitude has been undertaken in Ireland.
"It is a significant milestone in Cosc's goal to fill the gap of empirical evidence relevant to the lived experiences of the Irish population as a whole and, in particular, third-level students."
Elsewhere, Ellen O'Malley-Dunlop, of the Dublin Rape Crisis Centre, said the data showed little has changed since the last comprehensive study published back in 2002.
The Sava Report had also revealed the largest proportion of perpetrators were acquaintances, with few allegations reported, she said.
"Both reports show that victims still do not report because of feelings of shame and guilt," said Ms O'Malley-Dunlop.
"A big concern is the gap in knowledge of the specialist support services that are now available.
"From the Say Something research it is also evident that there is still a big gap in how we educate young people about sex, relationships and the responsible use of alcohol.
"We welcome the proposed national campaign to raise the awareness of the issues and of the supports available to students and we look forward to working with them to develop and deliver these campaigns."