BACKGROUND Children and adolescents involving in antisocial behaviour is one of the strongest predictors for development of antisocial personality disorder in adults where a rapid cognitive and physical development occurs during that stage of life. Even though knowing that antisocial behaviour is highly problematic to society due to disruption of societal norms, prevalence of this behaviour in the community is not known. Aim is to estimate the prevalence of antisocial behaviour among children and adolescent age groups. MATERIALS AND METHODS A total of 1026 participants, of both sexes, children and adolescents of age 6-18 years, from the educational institution of Shimoga district, where all the parents who were advised to come to the school and get interviewed by using child behaviour check list [CBCL (6-18 years)] in order to assess the antisocial behaviour among children and adolescent age groups; along with self-constructed questionnaires to assess personal bio-data and factors responsible for these behaviours. P < 0.05 was considered as statistically significant. RESULTS The overall prevalence of antisocial behaviour from both age groups was 10.43% and males had higher prevalence of antisocial behaviour compared to their female counterparts (p<0.05). The most prevalent antisocial behaviour was vehicle related nuisances (31.25%) followed by criminal damages (20.83%). Differences in causal factors among the genders were significant. CONCLUSION Identifying the factors associated with antisocial behaviour among children and adolescents is critical for developing effective preventive strategies. Early intervention will minimise the risk of progression to more serious criminal behaviour later in life. The study concluded that much antisocial behaviour exists among children and adolescents in school students. These behaviours were found to be significantly associated with the respondents' gender, parents' economic status and parenting style (P<0.05).