The study investigated the influence of Personality factors on Bullying among secondary school students in South western Nigeria. Participants consisted of 450 secondary school students and 150 teachers selected from 15 secondary schools across 10 Local government areas in south western Nigeria and 150 students 15 secondary schools across 10 local government area in Southwestern Nigeria in the second phase of the study. The study was guided by three research questions. The findings was analysed statisticall