This project focuses on The effect of audiovisual aids on the academic performance of senior secondary school students. This research work empirically explored the effect of audiovisual aids on the academic performance of senior secondary school students. The objectives of this study were to ascertain the extent to which audio-visual teaching aids are used in teaching secondary school students, identify factors influencing the use of audiovisual teaching aids in Secondary Schools, ascertain the relevance of the use of audio-visual teaching aids on the academic performance of secondary school students, identify strategies for improving the use of audiovisual aids teaching in secondary Schools. The scope of the study is secondary schools in Lagos and FCT, instructional material theories was used as a framework. The research design used for this study is survey, the population targeted for this study consists of student and staff of some selected secondary schools in Lagos and FCT, a total of 300 students and staff was used as sample size, 300 questionnaires administered to students and staffs and cluster sampling technique was applied. Instrument used for this study is the questionnaire. Data collected were collected from primary sources. From the analysis of the data, the findings revealed that the level of adoption of audio-visual aids in teaching secondary school students is low, factors such as financial constraint, the unwillingness of teachers to embrace new techniques of teaching and student seriousness level influence the use of audio-visual teaching aids in schools, audio-visual teaching aids have a significant impact on student academic performance, the government needs to bring up policies that will support the usage of audiovisual teaching aids. Following the findings, it was recommended that adoption of audio-visual teaching aids should be enforced by all schools in their teaching of students, the government should support schools financially to purchase necessary items, teachers should.