An intelligence agency is a government agency responsible for the collection, analysis, and exploitation of information in support of law enforcement, national security, military, public safety, and foreign policy objectives.

Means of information gathering are both overt and covert and may include espionage, communication interception, cryptanalysis, cooperation with other institutions, and evaluation of public sources. The assembly and propagation of this information is known as intelligence analysis or intelligence assessment.

Intelligence agencies can provide the following services for their national governments.

There is a distinction between "security intelligence" and "foreign intelligence". Security intelligence pertains to domestic threats, including terrorism and espionage. Foreign intelligence involves information collection relating to the political, or economic activities of foreign states.

Some agencies have been involved in assassination, arms trafficking, coups d'état, and the placement of misinformation propaganda and other covert and clandestine operations to support their own or their governments' interests.

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