Terrorism is no doubt a global problem of the 21st century and as evidenced by the continued terror attacks, the menace is causing major global security distress. In Kenya terrorism has among other things considerably affected the Muslim-Christian relations in the country. Despite vast literature on terrorism and interreligious relations, there are limited research on the influence of terrorism on Muslim-Christian relations in Garissa County, Kenya hence this study. The general objective of this study was to examine the influence of terrorism on Muslim-Christian relations in Garissa County, Kenya. The study employed both descriptive and explanatory design. The target population of the study was 199,469 from Garissa County from which a sample of 384 respondents were obtained through purposive sampling. Data was collected from primary sources using; questionnaires, interview guide and focus group discussions as well as secondary sources, through literature review. The findings revealed that, terrorist selective attacks of Christians and the use Islamic concept of jihad during attacks have created suspicion and mistrust among the Muslims and Christians in the area. The study concludes that unless the misunderstanding of the concept of Jihad is demystified, the Muslims-Christians relations will significantly be affected as the terrorist will continue propagating their attacks as an Islamic concept of jihad. The study recommends that Muslim leaders needs to demystify the concept of Jihad in order to restore Muslim-Christian relations. Also, the Government security agencies and civil society, Muslim leaders, and Christians should continually organize awareness campaigns in the region to create alertness about the terrorist’s schemes.