The study investigated the perceived impact of lesson observations on learners’ engagement and academic performance and effects on teachers’ professional growth and mentorship. Two research questions guided the study viz; what is the perceived impact of lesson observation practice on learners’ engagement and academic performance? What are the perceived effects of lesson observation on teachers’ mentorship and professional growth? A mixed methods research design was employed in the study. A sample of thirty (30) teachers and 12 learners were picked for the study. Data were collected via a questionnaire, focus group discussions and interviews. Nvivo and Descriptive statistics were the tools used for data analysis. The Major finding was that teachers held pos