Aim of the study: To analyse the prevalence of bullying and cyberbullying and their correlation with suicidal behaviour among school aged children, by performing a comparison between children in three countries: Israel, Lithuania and Luxembourg. Objectives. 1. To analyse and compare the prevalence of traditional bullying and cyberbullying among 15-years old children, according to their gender in the countries Israel, Lithuania and Luxembourg. 2. To analyse and compare the prevalence of suicidal ideation and behaviour among 15- years old children in Lithuania, Israel and Luxembourg. 3. To determine the correlation between traditional bullying, cyberbullying and suicidal behaviour among 15- years old children in Israel, Lithuania and Luxembourg, comparing their effects on the studied samples. CONCLUSIONS: 1. Although cyberbullying is a rapidly growing phenomenon nowadays, its prevalence among the samples of 15-years old adolescents in Israel, Lithuania and Luxembourg is still lower than that of traditional school bullying. Considering gender differences, the boys in Israel and Lithuania were more likely to be involved in traditional bullying, as opposite to Luxembourg where girls were more likely to be involved in this bullying type. Looking at gender differences and cyberbullying in the total sample boys were twice more likely to be involved in cyberbullying than girls. When comparing the three countries, the highest prevalence of adolescents that were cyberbullied was in Lithuania while the lowest was in Luxembourg. 2. Adolescent suicidality is a prevalent and serious problem nowadays with almost 10% of the studied sample admitting to actually attempting suicide. When comparing between the three countries, Lithuanian data has shown the highest prevalence of suicide related behaviours. 3. The results of the study show a strong and significant association between being a victim of cyber and/or school bullying and suicidal related behaviours. Being a victim of any kind of bullying can have a crucial effect on the ...