The reintegration of former Boko Haram members into society remains a significant challenge due to the affected victims’ experiences of depression and trauma because of terrorism, and their resistance towards reintegration, with implications for recidivism. To address this issue, we adopt an experimental design to test a novel Group-integrated Cognitive Behaviour Therapy (Gi-CBT) intervention compared to the media-orientation programme among 24 affected victims of terrorism from Borno, Maiduguri, Nigeria. Quantitative data was analysed using the Wilcoxon sign ranked test, whilst qualitative data was analysed using thematic analysis. We found that respondents from the experimental group showed more improvements in reducing and managing depression, including trauma suffered because of terrorism. Concerning reintegration, while there was no statistically significant improvement in attitude towards reintegration across both groups, the qualitative findings showed that participants in the experimental group expressed potential willingness to accept former Boko Haram members back due to the positive benefits of the intervention. Collectively, the insight gained from the study presents a significant contribution to improving the psychosocial impact of terrorism on affected victims whilst informing interventions designed to address these outcomes in countries sharing similar characteristics. The study recommends a fully powered randomised controlled trial to test Gi-CBT’s effectiveness.