Espionage organizations

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Espionage is a subset of human intelligence, one of many intelligence collection methods, which are organized by intelligence collection management.{{Cite journal |last=Katz |first=Brian |date=2020-07-13 |title=The Collection Edge: Harnessing Emerging Technologies for Intelligence Collection |url=https://www.csis.org/analysis/collection-edge-harnessing-emerging-technologies-intelligence-collection |language=en}}

This lists is restricted to organizations that operate clandestine human sources in foreign countries and non-national groups. It does not include police organizations with domestic informers, or, on an international basis, human sources that do counterintelligence work alone.