This document provides a summary of the 2013 Country Reports on Terrorism published by the United States Department of State. It discusses key trends in terrorism in 2013, including the evolving threat posed by al-Qa'ida affiliates in regions like Yemen, Syria, Iraq, Northwest Africa and the Sahel, as well as the rise of increasingly violent groups like the Islamic State of Iraq and the Levant. It also summarizes terrorism trends and issues in other regions like South Asia, North Africa, East Africa, and assesses the ongoing threats posed by various terrorist groups around the world.