The study examined teachers’ teaching experience and secondary schools’ performance in science subjects in Ondo state, Nigeria. The study specifically examined how teachers are distributed on the basis of teaching experience in the selected public secondary schools in Ondo state. The study also examined the influence of Biology, Chemistry and Physics teachers’ years of experience on students’ performance. The descriptive research design of the survey type and ex-post facto were adopted in this study. The population for the study consisted of all 1805 science teachers in public secondary schools in Ondo state. The sample for the study was 180 science teachers selected in Ondo State using multistage sampling procedure. The instruments that were used for this study are inventories. The first instrument was an inventory which sought for the teaching years of experience and science subject taught. The second instrument was an inventory on Senior Secondary School Certificate Examination results. The responses obtained were collated and analysed using descriptive statistics while the hypotheses were subjected to inferential statistics of Univariate analysis of Variance at 0.05 level of significance. The findings revealed that the performance of students in Biology was not determined by teachers’ experience in public secondary schools in Ondo State but their performance in Chemistry and Physics were determined by teachers’ experience. It was recommended among others that Government should make sure teachers with required experience are allowed to teach science subjects in schools as this would go a long way in  improving  the performances of the students’ in external examinations.

Keywords: Teachers, Teaching Experience, Students, Performance, Science Subjects,

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