ABSTRACT This study was designed to investigate into the effects of discipline on academic performance selected primary school in Buyobo Sub-County, Sironko District. Discipline in schools is a concern to both parents and educational administrators. As such, on important aspect that headteachers have to deal with as administrators is discipline in their schools. Discipline pays a key role in the process of education. To have an orderly and ideal learning situation, discipline is necessary for teachers and learners discipline in schools can be seen as an important element in the process of socialization and in the foundation of character, as a system of control s which enables teaching and learning to take place. Indiscipline in primary schools involves either individual learners or cliques of learners. There is massive deviance of school Niles and regulations in Buyobo SubCounty primary learners which include fighting and bullying within the school, fighting with other schools, interrupting matches, rape, defilement, riots, dodging lessons, stealing, going out without permission, drug abuse, drinking alcohol, smoking and open challenge to school authority. The list is endless. On the other hand, the academic performance of primary school learners has not been impressive. So, the study was aimed at finding out whether poor academic performance in primary schools in Buyobo sub-county was as a result of deterioration in discipline.