Terror has been officially defined by many states and international actors. Although these definitions differ from each other to a certain extent, the basic divergence appears in the definition of the terrorist, since it reveals who is considered an 'enemy' by those actors. The difference between the definitions and lists elaborated by the United States and by the European Union on 'terrorism, terrorist, and terror organization' indicates their respective perceptions of the enemy as well as their differing global policies on terrorism. In Turkey, a country marked by a 20 year long struggle against terrorism, the definition of these concepts is mostly limited to domestic politics. The objective of this paper is to compare and contrast the official definitions of terror, terrorist, and terrorist organization by these three actors, including their respective international positions on terrorism.