This study examined the Effects of Concept Attainment Strategy on the Academic Achievement and Interest of Chemistry Secondary School Students in northeast, Nigeria. Four (4) Research objectives, Research questions and Hypotheses were used to guide the study. The design used for this study was a pre-test, post-test quasi-experimental control group design. The target population of the study constitutes SS2 chemistry secondary school students in the six northeastern states. A total of one hundred and thirty-eight (138) students were selected by stratified simple random sampling to form the sample of the study. The instruments used for data collection in this study were the Chemistry Achievement Test (CAT) and Students’ Interest towards Chemistry Questionnaire (SITCQ) with reliability coefficient of 0.8 and 0.7. The major findings of the study are concept attainment strategy has positive effect on both the academic achievement and the interest of secondary school students. The study also proves that the strategy develops positive academic achievement in students and improves knowledge. Based on the findings of the study, it was recommended that the use of the strategy should be emphasized through conferences/workshops by professional bodies.