Many organizations that are accused of being a terrorist organization deny using terrorism as a military tactic to achieve their goals, and there is no international consensus on the bureaucratic definition of terrorism. Therefore, this list is of organizations that are, or have been in the past, designated as "terrorist organizations" by other notable organizations, including the United Nations and national governments, where the proscription has a significant impact on the group's activities.
This listing does not include states or governmental organizations, which are considered under state terrorism, or unaffiliated individuals accused of terrorism, which are considered under lone wolf terrorism. This list also excludes groups that are widely considered terrorist, but who are not officially so designated according to the criteria specified above.