This study investigated the effects of flipped classroom approach on Chemistry students’ academic achievement and retention in colleges of education, Yobe State Nigeria. Le Vygotsky’s theory provided the theoritical framework for the study. Two research questions and two hypotheses were formulated to guide the study. A pretest-posttest and postposttest control group quasi-experimental research design was employed in the study. The population of the study comprised of 524 NCE II Chemisty students from two colleges of education in Yobe State. Purposive and simple random sampling techniques were used to select 106 NCE II chemistry students. The experimental group (N=44) were taught redox concepts using flipped classroom approach while the control group (N=62) were taught the same redox concepts using lecture method of teaching. Redox Concept Achievement Test (RECAT) was the instrument used for data collection which was validated and tested for reliability. Mean and Standard Deviation were used to answer the research questions and the hypotheses were tested using independent sample T-test at 0.05 level of significance using SPSS software. The findings of the study revealed that the students taught redox concepts using flipped classroom approach have significantly higher academic achievement and retention scores than those who were taught using lecture method of teaching. Based on the findings, it was recommended among others that Chemistry lecturers/teachers should adopt the use of flipped classroom approach because it is a student-centered learning strategy that improves students’ academic performance.