| EPA | Environmental Protection Agency Washington, DC, http://www.epa.gov |
| USEPA | United States Environmental Protection Agency |
| LEA | Law Enforcement Agency |
| RA | Radiocommunications Agency |
| UTA | United Talent Agency |
| REA | Rail Express Agency |
| CNA | Central News Agency |
| EDA | European Defence Agency Brüssel, http://www.eda.europa.eu |
| CIA | Central Intelligence Agency |
| MCA | Medicine Control Agency medizinische Aufsichtsbehörde Großbritanniens |
| NSA | National Security Agency Fort Meade, http://www.nsa.gov |
| DLA | Defense Logistics Agency |
| IEA | International Energy Agency Paris, http://www.iea.org |
| DEA | Drug Enforcement Agency |
| DCA | Defense Communications Agency |
| E.N.A. | European news agency Brüssel, http://www.european-news-agency.com |
| CSA | Cyber Security Agency, EU |
| JMA | Japan Meteorological Agency |
| Prot. nat. | Protection de la nature Zeitschrift |
| COP | CPU Overheating Protection |
| PP | Protection Profile |
| ECDA | European Cycle Development Agency |
| FEMA | Federal Emergency Management Agency Washington, DC, http://www.fema.gov |
| NIMA | National Imaging and Mapping Agency |
| AEA | Austrian Energy Agency [engl.] Österreichischen Energieagentur ,Wien |
| EUREKA | European Reasearch Coordination Agency Agentur für europäische Forschungskoordination |
| AID | Agency for International Development [engl.] |
| APA | Austrian Press Agency [engl.] Wien, http://www.apa.co.at |
| IAEA | International Atomic Energy Agency Internationale Atomenergie Organisation [IAEO] |
| USIA | United States Information Agency |
| ERFA | European Radio Frequency Agency vgl. Brüssel, [BE], http://www.nato.int |
| JANA | Jamahiriya News Agency [engl.] Libysche Nachrichtenagentur |
| JEIA | Joint Export-Import-Agency |
| FIAT | Field Intelligence Agency Technical |
| DISA | Defense Information System Agency |
| IPS | Intelligent Protection System |
| GPF | General Protection Failure |
| OPM | Output Protection Management |
| EVP | Enhanced Virus Protection |
| MSP | Multiplexer Section Protection |
| EEP | Equal Error Protection |
| SFP | System File Protection |
| SPC | Supplementary Protection Certificate Verlängerung des Patentschutzes von Arzneimitteln |
| TPS | Thermal Protection System |
| UEP | Unequal Error Protection |
| SNP | Sequence Number Protection |
| CIPA | Children's Internet Protection Act |
| COPA | Child Online Protection Act |
| BUP | Buffer Underrun Protection |
| WFP | Windows File Protection |