The number of students who have experienced cyberbullying has risen by a third compared to last year.
A survey carried out for the National Association of Principals and Deputy Principals found the issue poses a clear threat to the collective morale of schools.
Over 1,000 adults and young people were surveyed last month and this month by Amárach Research for the association.
The survey showed that 16% of students said they had experienced cyberbullying, which was up by a third on the survey conducted last year.
It found 9% of students admitted to cyberbullying, which was up from 5% in 2013.
The research also found that just one in four parents monitored their children's online activity daily, with 15% saying they never checked.
The survey is part of the association's campaign to raise awareness of cyberbullying and to help schools and parents to tackle the problem.
The results come on the day the Irish Society for the Prevention of Cruelty to Children announces its Anti-Bullying Month, which will run for the month of March.