Twelve per cent of fourth class pupils say they are being bullied almost every week, according to a survey.
The survey was conducted as part of the International Association for Evaluation of Educational Achievement tests and involved 4,500 students.
A quarter of students said were bullied once a month and 64% said that they were hardly ever bullied.
Bullying behaviour included being made fun of or called names, left out of games, or activities, having lies spread about them, having something stolen from them, being hit or hurt by other students or being made do things they did not want to do.
The figures show that compared to schools internationally, Ireland has less bullying in schools.
Only four countries, Azerbaijan, Sweden, Georgia and Denmark, had a better bullying record.