The growing spate of ethno-religious crises and insurgency that characterizes Nigerian polity has been traced to inadequacies in the integration policies of the government. These situations have resulted in loss of several lives and unquantifiable psychological and material damages. However, the situations could improve through the use of effective teaching strategy which could restructure the prejudiced minds of students and encourage respect for other cultures. Therefore, the Jigsaw technique has been identified as a useful cooperative learning strategy that could be used for promoting national unity through education. The use of Jigsaw technique could discourage discrimination and promote mutual respect for other cultures. This study, therefore, examined jigsaw technique as an effective approach for ethnic integration and sustainable development in Ogun state, Nigeria. Two null hypotheses were generated and tested at 0.05 level of significance. The study adopted a pretest-posttest, control group, quasi-experimental design. A 30 item achievement test was administered on 126 junior secondary school students selected from two secondary schools in the south-west region of Nigeria. Data were analysed using analysis of co-variance. The findings of this study revealed that jigsaw technique benefited students who form jigsaw group (experimental group) than the conventional learning group (control group). Based on these findings, it is suggested that jigsaw technique should be used to complement the conventional lecture method as this could promote unity and peaceful co-existence among students. This could further translate into better integration and sustainable development in Nigeria.