This study assessed the impacts of truancy on students‟ academic performance in public secondary Schoolsin Morogoro municipality. Three secondary schools, 21 Students, 21 Teachers, 3 head of schools,3 academic masters, 3 discipline masters, 3WEO and 1DEO within Morogoro Municipality were selected. The data was collected through interviews and focus group discussion and document review to determine the impacts of truancy on students‟ academic performance. The study used quantitative approach which employed the case study in addressing the impacts of truancy on students‟ academic performance in public secondary schools. Qualitative data were analyzed through thematically narration. The study found that Poor Academic Performance, Failure to Accomplish Academic Assignments, Disruption of Classroom Dynamic and Repetition of Classes were the impacts of truancy on students‟ academic performance in Public Secondary Schools in Morogoro municipality.