The study investigated overcrowding classrooms and its impact on learners and teachers’ performance, efficiency and effectiveness. This action was prompted by the researcher’s observation of learners’ poor performance and teachers’ loss of instructional time in overcrowded classrooms. Literature was reviewed to place the study in gap lapse prospective which this study was to fill. Quantitative research method was used to be able to collect the most applicable data that would be able to produce valid and reliable information for the compilation of the research report. Revelations from the collected data were that overcrowded classrooms have adverse effects on both the teacher and learner performance and activities in schools where overcrowding is evident. Based on the revelations the research made some recommendations to contribute towards finding solution to the problem investigated in this study. The conclusion that could be drawn was that there is need for the Department of Education (DoE) to conduct elaborate study in schools where overcrowding exists and make a concerted effort to provide adequate classrooms to be able to help learners and teachers benefit from the provision of education being delivered.