The purpose of this study was to examine the influence of indiscipline on the academic achievement of secondary school students in Umuahia North Local Government Area of Abia State. The study was conducted in the 5 public secondary schools in Umuahia North Local Government Area. The study employed descriptive survey design .Two research questions guided the study. The target population consisted of 243 teachers and 5,650 students. The sample included 20 teachers and 180 students. The samples were drawn using simple random sampling technique. To ensure reliability and validity, a pilot study was carried out. The data was collected through questionnaire administered to teachers and students by the researchers. The data was analyzed using mean scores. The findings of the study revealed that the causes of indiscipline were due to influence from the environment and their homes, namely, mobile phones, responsibilities at home among others. It was also found that Indiscipline influences the academic achievement of students negatively. Recommendations were made based on the findings which included that school administrations should establish active mandatory school – based families and put in place intensive parent – mentoring programmes which is aimed at sensitizing parents on their parental duties among others.