| AA | American Airlines | In English | |
| AA | Aerolíneas Argentinas | In Spanish | |
| AAC | Apprentissage Anticipé de la Conduite | In French | → Education |
| AACO | Arab Air Carriers Organization | In English | → Organizations and associations |
| AAFVDL | Association d'Animation Ferroviaire de la Vallée Du Loir | In French | → Organizations and associations |
| AAHSTO | American Association of State Highway and Transportation Officials | In English | → Associations |
| AAIA | Al Ain International Airport | In English | |
| AAR | Association of American Railroads | In English | → Associations |
| ACAST | Association Contre les Aéroports du Sud Toulousain (www.acast.fr) | In French | → Associations → Spaceflight engineering, astronautics |
| ACC | Automatic Cruise Control | In English | → Vehicle engineering |
| ACFCdN | Association des Chemins de Fer des Côtes-du-Nord | In French | → Associations → Civil engineering and land transport |
| ACI | Automobile Club d'Italia | In Italian | → Organizations and associations → Automobile manufacturing |
| ACNAT | (Collectif des) Associations Contre un Nouvel Aéroport Toulousain | In French | → Aeronautics, aircraft |
| ACNUSA | Autorité de Contrôle des Nuisances Aériennes | In French | → Public administration, government |
| ADF | Autoroutes de France | In French | |
| ADI | Association des Doctorants de l'INRETS | In French | → Associations → Higher education, universities → Vehicle engineering |
| ADP | Aéroports de Paris | In French | |
| ADP | Association pour le Développement de la Philatélie | In French | → Associations |
| AEA | Association of European Airlines | In English | → Associations |
| AEC | Association Européenne des Cheminots | In French | → Associations |
| AFA | Association of Flight Attendants | In English | → Associations → Education |
| AFCE | Association Française des Cheminots pour l'Espéranto = FFEA | Franca Fervojista Esperanto-Asocio | In Esperanto |
In French | → Associations → Rail transport engineering |
| AFER | Autoritatea Feroviară Română | In Romanian | → Central administration |
| AFIL | Alerte de Franchissement Involontaire de Ligne | In French | → Automobile manufacturing |
| AFM | American Federation of Motorcyclists | In English | → Organizations and associations |
| AFM | Association Fribourgeoise Motocycliste | In French | → Associations |
| AFT | Association pour le développement de la Formation professionnelle dans les Transports | In French | → Organizations and associations → Labour, labour economics → Education |
| AFT | Agence Ferroviaire de Télécommunications | In French | → Telecommunications → Rail transport engineering |
| AFTRI | Association Française des Transports Routiers Internationaux | In French | → Associations → Higher education, universities |
| AGC | Autorail Grande Capacité | In French | → Vehicle engineering |
| AHICF | Association pour l'Histoire des Chemins de Fer en France | In French | → Organizations and associations → History |
| AHTS | Arbejdsgiverforeningen for Handel, Transport og Service | In Danish | → Organizations and associations → Trade → 33846 |
| AIABDS | Association des Imprimeries Africaines de Billets de Banque et de Documents de Sécurité | In French | → Organizations and associations → Financial markets |
| AIDE | Adaptive Integrated Driver | In English | → Vehicle engineering |
| AIMAC | Académie Internationale Mohammed 6 d'Aviation Civile | In French | → Specialized or (poly)technical colleges → Aeronautics, aircraft |
| AIMSUN2 | Advanced Interactive Microscopic Simulator for Urban and Non-Urban Networks | In English | → Computer simulation |
| AIN | Austrian Institute of Navigation = ÖVN | Österreichischer Verein für Navigation | In German |
In English | → Geodesy, cartography → Vehicle engineering |
| AIPCR | Association Internationale Permanente des Congrès de la Route | In French | → Associations → Congresses |
| ALC | Air Logistics Center | In English | → Maintenance and logistics |
| AMA | American Motorcyclist Association | In English | → Associations |
| AMA | Agenzia Milanese Mobilita' e Ambiente | In Italian | → Nature → Vehicle engineering |
| AMAL | Aviation Medical Acceleration Laboratory | In English | → Research institutes → Medicine |
| AMDB | Airport Mapping Databases | In English | |
| ANPER | Association Nationale de Promotion de l'Éducation Routière | In French | → Associations → Education |
| ANT | Advanced Navigation Trainer | In English | |
| APEL | Autoroutes Paris-Est-Lorraine | In French | |
| APSN | Advanced Passive Safety Network | In English | |
| APTE | Association Poste Télécom Espéranto | In French | → Associations → Telecommunications |
| AQP | Association Qualité Pesage (www.aqp.asso.fr) | In French | → Associations |
| ARAMIS | Agencement en Rames à Modules Indépendants | In French | |
| ARCHISIM | Architecture, modélisation de la conduite automobile et simulation de trafic | In French | |
| ARCOS | Action de Recherche pour une COnduite Sécurisée | In French | → Vehicle engineering |
| ARISE | Automatic Railway Information Systems for Europe | In English | → Rail transport engineering → Telecommunications |
| ARR | Autoritatea Rutieră Română | In Romanian | → Central administration |
| ASECNA | Agence pour la Sécurité de la Navigation Aérienne en Afrique et à Madagascar | In French | → International relations |
| ASENDIS | Asociación Española de Entidades de Distribución | In Spanish | → Associations |
| ASF | Autoroutes du Sud de la France | In French | |
| ASFA | Association des Sociétés Françaises d'Autoroutes (www.autoroutes.fr) | In French | → Organizations and associations |
| ASFINAG | Autobahnen- und Schnellstraßen-, Finanzierungs Aktiengesellschaft | In German | |
| ASO | Aviation Safety Office | In English | → Aeronautics, aircraft |
| ASQUER | ASsociation pour la QUalification des Équipements de la Route | In French | → Associations |
| ASSR | Attestation Scolaire de Sécurité Routière | In French | → Education |
| ATA | Air Transport Association (www.airlines.org) | In English | → Associations |
| ATAM | Azienda Trasporti per l'Area Metropolitana | In Italian | → Organizations and associations |
| ATAM | Azienda Trasporti Automobilistici Municipali | In Italian | |
| ATEC | Association pour le développement des techniques de Transport, d'Environnement et de Circulation | In French | → Organizations and associations → Nature → Vehicle engineering |
| ATMB | (Société des) Autoroutes et du Tunnel du Mont-Blanc | In French | |
| ATR | Air Transport Radio | In English | → Aeronautics, aircraft |
| ATR | Air Transport(ation) Rack | In English | → Aeronautics, aircraft |
| ATR | Air Transport Rating | In English | → Aeronautics, aircraft |
| AVL | Automatic Vehicle Location | In English | → Vehicle engineering |
| AVLS | Automatic Vehicle Localization System | In English | → Vehicle engineering |
| BAAC | Budget Annexe de l'Aviation Civile | In French | → Aeronautics, aircraft |
| BAAC | Bulletin d'Analyse des Accidents Corporels (de la circulation) | In French | → Medicine |
| BANA | Budget Annexe de la Navigation Aérienne | In French | → Aeronautics, aircraft |
| BAST | Bundesanstalt für Straßenwesen | In German | |
| BDR | Banque de Données Routières | In French | |
| BDV | BioDiesel Vienna | In English | |
| BEPTOM | Bureau d'Études des Postes et Télécommunications d'Outre-Mer | In French | → Telecommunications |
| BIVV | Belgisch Instituut voor Verkeersveiligheid | In Dutch | |
| BNA | Bureau de Normalisation de l'Automobile | In French | → Automobile manufacturing |
| BNEVT | Bureau de Normalisation de l'Exploitation de la Voirie et des Transports | In French | → Civil engineering and land transport |
| BNVET | Bureau de Normalisation de l’Exploitation, de la Voirie et des Transports | In French | → Civil engineering |
| BOMET | Bulletin Officiel du Ministère de l'Équipement et des Transports | In French | → Serial publications, periodicals → Central administration |
| BOMULTE | Bulletin Officiel du Ministère de l'Urbanisme, du Logement, des Transports et de l'Environnement | In French | → Serial publications, periodicals → Central administration → Nature and society, |
| BRF | Brigade des Réseaux Férrés | In French | → Public administration, government |
| BSG | Bahnsicherheitsgesellschaft | In German | → Rail transport engineering |
| BSR | Brevet de Sécurité Routière | In French | → Education |
| CAB | Civil Aviation Board | In English | → Aeronautics, aircraft |
| CAN | Compagnie Auxiliaire de Navigation | In French | |
| CAUG | Civil Aviation Users Group | In English | → Organizations and associations → Aeronautics, aircraft |
| CCCPA | Cleveland-Cuyahoga County Port Authority | In English | → Municipal administration |
| CCFE | Communauté des Chemins de Fer Européens | In French | → Organizations and associations |
| CCIERBC | Comité Consultatif INRETS d'Éthique sur la Recherche Biomédicale et Comportementale | In French | → Organizations and associations → Ethics → Medicine |
| CCM | Compagnie Corse Méditerranée | In French | |
| CCR | Centrale Commissie voor de Rijnvaart = CCR | Commission Centrale pour la Navigation du Rhin | In French = CCR | Central Commission for Navigation on the Rhine | In English = ZKR | Zentralkommission für die Rheinschifffahrt | In German |
In Dutch | |
| CCR | Commission Centrale pour la Navigation du Rhin = ZKR (look above) |
In French | |
| CCR | Central Commission for Navigation on the Rhine = ZKR (look above) |
In English | |
| CCS | Cargo Community System | In French | |
| CEDEX | Courrier d'Entreprise à Distribution EXceptionnelle | In French | |
| CEMT | Conferinţa Europeană a Miniştrilor de Transport | In Romanian | → International relations → Central administration |
| CEMT | Conférence Européenne des Ministres des Transports (www.cemt.org) = ECMT | European Conference of Ministers of Transport | In English |
In French | → European Union |
| CENA | Centre d'Études de la Navigation Aérienne | In French | |
| CEPT | Conférence Européenne des Postes et Télécommunications (www.cept.org) | In French | → Organizations and associations → Telecommunications |
| CERP | Comité Européen de Réglementation Postale (www.cept-cerp.org) | In French | → International relations |
| CERTU | Centre d'Études sur les Réseaux, les Transports, l'Urbanisme et les constructions publiques | In French | → Civil engineering → Building |
| CETE | Centre d'Étude Technique de l'Équipement | In French | → Civil engineering |
| CETUR | Centre d'Études Techniques des Transports Urbains | In French | → Vehicle engineering |
| CFNR | Compagnie Française de Navigation Rhénane | In French | |
| CFTE | Center for Transportation Excellence | In English | → Vehicle engineering |
| CFTV | Chemin de Fer Touristique du Vermandois | In French | → Tourism |
| CGFTE | Compagnie Générale Française de Transports et d'Entreprise | In French | |
| CGM | Compagnie Générale Maritime | In French | |
| CGNR | Compagnie Générale pour la Navigation du Rhin | In French | |
| CHMAC | Coopération Homme-Machine pour l'Assistance à la conduite | In French | → Human-computer interaction → Vehicle engineering |
| CICOM | Carrefour International de la Communication | In French | → Telecommunications |
| CIF | Centre International de Fret | In French | |
| CIGT | Centre d'Ingénierie et de Gestion du Trafic | In French | |
| CISR | Comité Interministériel de Sécurité Routière | In French | → Central administration |
| CITILOG | Carrefour Intelligent - Traitement d'Images LOGiciels | In French | → Image processing |
| CMA | Compagnie Maritime d'Affrètement | In French | → 6295 |
| CMSRSC | Maritime Silk Roads Study Centre | In English | → Research institutes |
| CNA | Caisse Nationale des Autoroutes | In French | → Civil engineering |
| CNAFMC | Caisse Nationale d'Allocations Familiales des Marins du Commerce | In French | → Social welfare |
| CNAFNI | Caisse Nationale d'Allocations Familiales de la Navigation Intérieure | In French | → Social welfare |
| CNBA | Chambre Nationale de la Batellerie Artisanale | In French | → Organizations and associations |
| CNC | Compagnie Nouvelle de Conteneurs | In French | |
| CNIR | Centre National d'Information Routière | In French | |
| CNN | Compagnie Nationale de Navigation | In French | |
| CNP | Compagnie Navale des Pétroles | In French | → 665 |
| CNRB | Caisse Nationale de Retraite de la Batellerie | In French | → Labour, labour economics → Insurance |
| CNS2T | Communication, Navigation et Surveillance pour les Transports Terrestres | In French | |
| CODATU | COnférence sur le Développement et l'Aménagement des Transports Urbains pour les pays en développement | In French | |
| COLITRAH | Comité de Liaison pour le Transport des Personnes Handicapées | In French | → Medicine |
| CONFETRA | Confederazione Generale Italiana del Traffico e dei Trasporti | In Italian | → Organizations and associations |
| COPEC | Contribution de la Psychologie et de l'Ergonomie Cognitives (à la coopération homme-machine dans la conduite automobile) | In French | → Human-computer interaction → Psychology → Vehicle engineering |
| CORESSA | Compagnie de Restauration et de Services Aéroportuaires | In French | → 64 |
| COTAM | Commandement du Transport Aérien Militaire | In French | → Public administration, government → Military engineering |
| CPNAMB | Caisse Primaire Nationale d'Assurance-Maladie de la Batellerie | In French | → Insurance → Medicine |
| CRC | Centre de Régulation de la Circulation | In French | |
| CRPN | Caisse de Retraite du Personnel Navigant | In French | → Labour, labour economics → Insurance |
| CRPNPAC | Caisse de Retraite du Personnel Navigant de l'Aéronautique Civile | In French | → Labour, labour economics → Insurance |
| CSA | Contrôle Sanction Automatisé | In French | → Public administration, government |
| CSST | Centro Studi sui Sistemi di Trasporto | In Italian | → Vehicle engineering |
| CSTA | Chambre Syndicale du Transport Aérien | In French | → Organizations and associations |
| CUTE | Clean Urban Transport Europe | In English | → Vehicle engineering |
| CWL | Cardiff International Airport (www.cwlfly.com) | In English | → Aeronautics, aircraft |
| DAI | Détection Automatique d'Incident | In French | → Image processing |
| DAPO | Direction des Approvisionnements de la Poste | In French | |
| DEFA | Dana Esperantista Fervojista Asocio | In Esperanto | → Associations → Rail transport engineering |
| DFA | Dutch Flight Academy (www.dfa-fto.nl) | In English | → Specialized or (poly)technical colleges → Aeronautics, aircraft |
| DGMT | Direction Générale de la Mer et des Transports | In French | → Vehicle engineering |
| DGP | Direction Générale de la Poste | In French | → Central administration |
| DHS | Dansk Handel og Service | In Danish | → Organizations and associations → 33846 |
| DNA | Direction de la Navigation Aérienne | In French | → Spaceflight engineering, astronautics |
| DoRIS | Donau River Information Services | In English | |
| DoT | Department of Transportation (www.dot.gov) | In English | → Central administration |
| DOT/CIAP | DOT Climatic Impact Assessment Program | In English | → Meteorology, climatology |
| DPD | Direct Parcel Distribution | In English | |
| DR | Direction des Routes | In French | → Public administration, government |
| DRACULA | Dynamic Route Assignment Combining User Learning and Microsimulation | In English | → Computer simulation |
| DRCR | Direction des Routes et de la Circulation Routière | In French | → Civil engineering |
| DRE | Direction Régionale de l'Équipement | In French | → Public administration, government |
| DRIVE | Dedicated Road Infrastructure for Vehicle safety in Europe | In English | |
| DSCR | Direction de la Sécurité et de la Circulation Routières | In French | |
| DSCR | Direction de la Sécurité et de la Circulation Routière | In French | |
| DTT | Direction des Transports Terrestres | In French | |
| EASA | European Aviation Safety Agency | In English | → Organizations and associations → Aeronautics, aircraft |
| EATE | Entreprise Artisanale des Transports par Eau | In French | |
| ECAC | European Civil Aviation Conference | In English | → Organizations and associations → Aeronautics, aircraft |
| ECMT | European Conference of Ministers of Transport (www.cemt.org) = CEMT (look above) |
In English | → European Union |
| ECTRI | European Conference of Transport Research Institutes | In English | |
| EDA | Études Détaillées d'Accidents | In French | |
| EFIP | European Federation of Inland Ports = FEPI | Fédération Européenne des Ports Intérieurs | In French = EVB | Europäischer Verband der Binnenhäfen | In German |
In English | → Organizations and associations |
| EGCTU | Établissement de Gestion et de Contrôle du Trafic Urbain | In French | |
| EITS | Enhancing International Travel Security | In English | |
| ELF-AREK | Esperanto-Ligo Filatelista - Amika Rondo de Esperantaĵ-Kolektantoj | In Esperanto | → Organizations and associations |
| EMA | Espace Métro Accords | In French | → Music |
| EMM | Établissement de Maintenance du Matériel | In French | → Maintenance and logistics |
| EMT | Établissement Matériel Traction | In French | |
| ENAC | Ente Nazionale per l'Aviazione Civile | In Italian | → Aeronautics, aircraft |
| ENSPT | École Nationale Supérieure des Postes et Télécommunications | In French | → Specialized or (poly)technical colleges → Telecommunications |
| EPSN | European Passive Safety Netwok | In English | |
| ERAC | European Rail Research Advisory Council | In English | → Organizations and associations → Rail transport engineering |
| ERRI | European Railway Research Institute | In English | → Rail transport engineering |
| ERT | Europe Recherche Transport | In French | |
| ERTRAC | European Road Transport Research Advisory Council (www.ertrac.org) | In English | → Organizations and associations → Vehicle engineering |
| ESFTF | École Supérieure de Formation du Transport Ferroviaire | In French | → Specialized or (poly)technical colleges → Rail transport engineering |
| ETF | Européenne de Travaux Ferroviaires | In French | → Rail transport engineering |
| ETIS | European Transport Policy Information System | In English | → Data |
| ETSC | European Traffic Safety Council | In English | |
| EURNEX | European Rail Research Network of Excellence | In English | |
| EVB | Europäischer Verband der Binnenhäfen = EFIP, FEPI (look above) |
In German | → Organizations and associations |
| EWAS | Elektronisches Waggon-Alarmierungssystem | In German | |
| EWG | Eurowings | In English | |
| FAA | Federal Aviation Administration (www.faa.gov) | In English | → Central administration → Aeronautics, aircraft |
| FARIT | Fonds d'Aide à la Recherche et à l'Innovation dans les Transports | In French | → Research policy → Vehicle engineering |
| FCC | Fully Cellular Containership | In English | |
| FCVV | Federale Commissie Verkeersveiligheid | In Dutch | → Public administration, government |
| FCyT | Federación de Comunicación y Transporte | In Spanish | → Organizations and associations → Labour, labour economics → Telecommunications |