The study examined the Influence of Animation Cartoons on Social Behaviour of Primary School Pupils in Kaduna Metropolis, Kaduna State, Nigeria. Three research objectives, three research questions and three hypotheses guided the conduct of the study. The research adopted the ex-post-facto research design. Data were collected from a total sample of three hundred and eighty-one (381) upper primary school pupils in two Local Government Areas (Kaduna North and Kaduna South) within Kaduna Metropolis using three different questionnaires: Aggression Scale, Assertive Scale and Friendly Scale with Cronbach alpha reliability of 0.809, 0.825 and 0.851 respectively. The data collected were analysed using the inferential statistics of t-test. Each hypothesis was tested at 0.05 alpha level of significance. The results of the study revealed that significant difference exist in the influence of animation cartoons on aggressive behaviour of frequent and less frequent viewers (t= 10.641, p=0.000), on assertive behaviour of frequent and less frequent viewers (t= 25.251, p=0.026) and on friendly behaviour of frequent and less frequent viewers(t= 18.47, p=0.000). The following recommendation was made; Counsellors should guide and advise Parents and School Administrators on how to choose and use appropriate animation cartoons for children to view that will enhance the development of positive social behaviour.