Abstract: Illegal immigrants have been blamed for a number of terrorist attacks, including those on the Westgate, Garissa University, and Lamu County. Considering that North Eastern Region is bordered by Somalia, which has been embroiled in civil war for many years, this study is all the more important. As a result, it focuses on the effects of illegal immigration on security in Kenyas north eastern region. The studys specific goals were to determine the economic effects of illegal immigration on security, to evaluate immigration policy laws on security, and to establish cross-border crimes in Kenyas north eastern region on security. Moral Panic Theory and Sociological Theory were both used in this study.