As a criminal act, terrorism is the most fundamental problem of the world society that abuses human rights and it is categorized as the most dangerous threat against the rights of nations and stability at the international level. Since the occurrence of such actions is very high in the world, terrorism is essential to fight. Terrorism financing is the act of providing financial, war, logistics, and any other kind of facilities for terrorist activity. We witness its increase instead of decrease. However, it galloping increase can be stopped if the governments cooperate and create international rules. One way for this purpose is combating the financing of terrorism. For this reason, governments have taken measures to prevent the financing of terrorism either with the help of the United Nations and cooperation with other governments or directly by themselves. CFT Convention is an international convention to combat the financing of terrorism signed by the United Nations. Financing is one of the acts necessary for terrorism so terrorist groups can not realize their goals if they are not supported financially. This issue is important to the extent that terrorist groups do their utmost to fund their actions. The criminal activities that provide funding for terrorism are occupied territories, illicit trade, and committing organized crimes. In other words, it can be noted that today, the world is facing the economy of terrorism, an issue that all of us should try to fight.