Several national governments and two international organizations have created lists of organizations that they designate as terrorist. The following list of designated terrorist groups lists groups designated as terrorist by current and former national governments, and inter-governmental organizations. Such designations have often had a significant effect on the groups' activities.

Many organizations that have been designated as terrorist have denied using terrorism as a military tactic to achieve their goals, and there is no international consensus on the legal definition of terrorism.

This listing does not include unaffiliated individuals accused of terrorism, which is considered lone wolf terrorism. This list also excludes groups which might be widely considered terrorist, but who are not officially designated according to the criteria specified above.

Organizations listed by the United Nations Security Council ISIL (Da'esh) and Al-Qaida Sanctions Committee.

Below is the list of organizations that have officially been designated as terrorist in the past, by the respective parties, but have since been delisted.

Among the countries that publish a list of designated terrorist organizations, some have a clear established procedure for listing and delisting, and some are opaque. The Berghof Foundation argues that opaque delisting conditions reduce the incentive for the organization to abandon terrorism, while fuelling radicalism.

Since 2002, the Australian Government maintains a list of terrorist organizations under the Security Legislation Amendment (Terrorism) Act 2002. Listing, de-listing and re-listing follows a protocol that mainly involves the Australian Security Intelligence Organisation and the Attorney-General's Department.

The Ministry of Foreign Affairs maintains a public list of designated terrorist individuals and entities.