The purpose of this research is to discover the effect of cyber bullying on students academic achievement and their behavior. The objective of the research was to find out the academic achievement affected by cyberbullying and behavior of students on gender basis at higher secondary school level. Through random sampling technique, 2160 students and 48 teachers from 6 districts were selected. Questionnaires and interviews were used for data analysis using descriptive statistics and inferential statistics. The results showed that cyber bullying significantly affects students academic achievement than their behavior. No significant effect of cyber bullying was found on students academic achievement and their behavior with respect to their gender. The qualitative data obtained from interviews teachers concludes that students are well aware of cyber bullying and cyber bullying equally affects boys and girls of public sector higher secondary schools.