Bullying is a complicated issue that arises from intricate relationships between family members, peers, the school community, and culture. One of the key indicators of bullying is parental variables. Studies linking various parental factors to bullying behaviour or roles are scarce, particularly in Nigeria. Therefore, this study examined parental factors as predictors of in-school adolescents’ bullying behaviors in Kwara state, Nigeria. The population comprised 223, 893 in-school adolescents in Kwara State and a sample of 400 was drawn from this population across the State. The data were collected through the use of researchers’ designed scale. The data collected were analysed using descriptive and inferential statistic. In the results, parental factors significantly predict in-school adolescents bullying perpetration and victimization. Based on the findings of the study appropriate recommendations were made.