There is a growing concern with the growth and prevalence of delinquency among selected secondary schools in Ngando, Nairobi County. The purpose of this study was to investigate the role of counselling on delinquency among students in selected secondary schools in Ngando, Nairobi County. The study was guided by Self-Determination Theory of motivation by Edward Deci and Richard Ryan and employed an embedded mixed methods design. The research objectives assessed the prevalence of delinquency, explored the types of counselling used, examined the relationship between the types of counselling used and prevalence of delinquency andto identify effectiveness of psycho-spiritual strategies employed to enhance delinquency among students in the selected secondary schools, Ngando. The target population was 400 students and teachers while the sample was 200 respondents selected through random and purposive samplings methods. However, only 189respondents were able to participate.The researcher used both questionnaires and interview guides to collect data. The data collected wasanalyzed in relation to the research objectives.For the quantitative data, the researcher used frequency tables, Standard Deviations and Pearson Correlations. The qualitative data was presented in narrative form using the research objective themes. The study established that the most common forms of delinquent behaviors among students included violence, drug abuse, stealing, truancy and unhealthy indecent relationships while the most common types of counselling included individual counselling, group counselling and career counselling while family counselling was rarely used. The study also revealed that there was significant relationship between the different types of counselling and reduction of delinquent behaviors among students. The intervention measures such as psycho-spiritual counselling, role modelling, motivational talks; some light punishments were helping to reduce cases of delinquent behaviors among students in areas such as school dropout, truancy and had enhanced academic performance. The study recommended deployment of trained psychotherapists in secondary schools to reduce and treat cases of delinquent behaviors.