Makinde, Bola OMustapha, Mulikat L.AOkesina, Falilat Anike2021-05-052021-05-0520162504-8791https://uilspace.unilorin.edu.ng/handle/20.500.12484/4950Bullying behaviour refers to the intimidation of a weaker person: it is the process of intimidating or mistreating someone who is weaker or in a more vulnerable situation. This study established the effectiveness of Client-Centred Therapy (CCT) in reducing Bullying Behaviour among In-school adolescents. The study was Quasi experimental in nature using a 2 x2 x2 factorial design made up of two (2) row groups (one experimental and one control) and two (2) column groups (age and gender). Instrument used for the study was Bullying Identification Questionnaire (BIQ). Bullying behavior was studied; only those that scored high in bullying items and less in victimisation items participated in the study. CCT was found effective in the reduction of bullying behaviour among in-school adolescents F (df= 1, 47)= 34.6); F (df= 1, 47)= 52.5. p< 0.05) respectively. CCT reduced bullying behavior more significantly among in-school adolescents within the age range of 15 - 19 years than adolescents within the age range of 10 -14 years. It was recommended that CCT be used in the treatment of in - school adolescents with bullying behaviours.enBuliesBullying BehaviourCleint-Centered TherapyIn-School AdolescentsPower StruggleArticle