This paper is entitled "Terrorism and Iraqi National Security 2003-2017: the Socio-Economic and Cultural Losses". It discusses the impact of the acts of terrorist groups, especially by Al Qaeda and ISIS on Iraqi national security. Besides, it highlights the impact of terrorist groups on the Iraqi national unity, and socio-cultural sectors of Iraq's society. The findings of our paper show the wide range extent of damages done by the two mentioned terrorist organizations on Iraq's national security, in terms of cost, time, and quality. Besides, the terrorist acts, especially that of ISIS, had a profound effect on Iraq's peace, stability, and had disrupted the social cohesion of Iraqi society. Keywords: ISIS, Al-Qaeda, National Security, Culture, and Iraqi Society