AbstractThe study was of quasi-experimental design. It was conducted to determine the effect of peer bullying education given to adolescents on their knowledge, attitude and behaviors. Adolescents between 12-15 years of age who are all studying at a primary school, 141 adolescent were included in training. The 26 questions were asked to adolescents that measure knowledge, attitudes and behaviour. Training lasted for 5 weeks and meeting was held with students one hour each week. Increasing in knowledge, attitude and behaviour scores of adolescents before and after education were found statistically significant. When viewed in scores of knowledge between the classes, knowledge score was statistically increased in all grades. However, in 6th grades scores were lower compared to the other classes.