The objective of this study was to determine the influence of Biology teachers’ on academic performance of students in senior secondary schools in South-West Geopolitical zone, Nigeria. It was a descriptive research of the survey type in which simple random sampling technique was used to select 102 senior secondary schools in South-West zone, Nigeria. Two hundred and four (204) biology teachers were involved in the study. The data collected were analyzed using frequency count, percentages and t-test. These were used to answer the research questions and also test the hypotheses. The findings of the study showed that Biology teachers generally had positive influence on academic performance of students while there was no significant difference based on gender and years of teaching experience. It is recommended that the adequate instructional materials should be made available for Biology teachers to further enhance their positive influence on the students’ academic performance. Both male and female science teachers should be encouraged by provision of special incentive for improvement on their influence on students’ academic performance. Both less experienced and experienced Biology teachers should be encouraged to acquire more professional experience in order to improve more on their influence to students’ academic performance.
Keywords: Influence, Biology Teachers, Academic Performance, Students, Senior Secondary Schools