The concept and nature of insurgency always invoke the spirit of terror, evil and rebellion.  Nigerian situation is a sterling example where a certain group called 'Boko Haram‘, has unleashed mayhem that have shocked the very political, economic and security foundations of this country. The Boko Haram Islamic fundamentalist sect which has been declared as an international terrorist organization and described as having links with another terrorist group, the Al Queda.  The terrorist are elements to destabilize the government, national security and peace of the nation, Nigeria. The truth remains that this deadly group has unleashed a reign of terror that resulted in callous destruction of lives both great and small, most of whom are of northern extraction of various religious divides. The foreigners who came to invest were not spared as well and properties worth billions of naira have been destroyed. Hence, the aim of this paper is to show the effect of boko haram insurgency in Nigeria and examine how it affects our national security