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| AAC | Assumed Allowable Concentration |
| AADL | Average Annual Daily Load |
| AAIB | Air Accident Investigation Branch (UK) |
| AAPEA | Australian Petroleum Production & Exploitation Association |
| AAPG | American Association of Petroleum Geologists |
| AAQS | Ambient Air Quality Standards; |
| AARH | Arithmetic Average Roughness Height |
| AAV | Annulus Access Valve |
| AB | Breathing Air |
| ABCB | Association of British Certification Bodies |
| ABF | Aquatic Base Flow; |
| ABLJ | Adjustable Buoyancy Life Jacket |
| ABLOS | IHO-IAG-IOC Advisory Board on the Law of the Sea |
| ABMA | American Boiler Manufacturers Association |
| ABNR | Available But Not Required |
| ABOI | Association of British Offshore Industries website |
| ABS | American Bureau of Shipping |
| Acrylonitrile Butadiene Styrene | |
| ABST | Abstract |
| AC | Alternative Current |
| ACA | Annual Charge Adjustment |
| ACB | Air Circuit Breaker |
| ACC | Annulus Choke : Closed |
| ACCA | Air Condition Contractors of America website |
| ACDE | Association of Commercial Diving Educators website |
| ACE | Area Control Error |
| Advanced Collaborative Environment | |
| ACEORR | Advisory Committee on Improved Oil Recovery Research (UK DTI, before 1998) |
| ACFM | Alternating Current Field Measurement |
| ACHARR | Advisory Committee on Hydrocarbons Additional Recovery Research |
| ACHP | Advisory Council on Historic Preservation |
| ACG | Azeri-Chirag-Gunashi (Oil fields in the Azarbaidjani sector of the Caspian sea) |
| ACI | American Concrete Institute website |
| ACMH | Actual Cubic Meter per Hour |
| ACO | Annulus Choke : Open |
| ACoP | Approved Code Of Practice |
| ACOPS | Advisory Committee on Protection of the Sea |
| ACP | Atmospheric Chemistry Program |
| ACPQA | Association pour la Certification et la Qualification en Peinture Anticorrosion |
| ACQ | Annual Contract Quantity |
| ACR | Attenuation Crosstalk RatioAttenuation Crosstalk Ratio |
| ACRI | Air Conditionning and Refrigeration Institute (USA) website |
| ACRS | Accelerated Cost Recovery System |
| ACSM | Alternating Current Stress Measurement |
| ACV | Annulus Circulation Valve |
| AD | Auto Drain |
| ADA | Australian Diver Accreditation Scheme |
| ADB | African Development Bank website |
| ADC | Air Diffusion Council (USA) website |
| ADC | Association of Diving Contractors |
| ADCP | Acoustic Doppler Current Profiler |
| ADDS | Airborne Dispersant Delivery System |
| ADELIE | Aide au Dépouillement Intéractif des données des Engins sous-marins |
| ADEME | French agency for energy managing and environment |
| ADEOS | Advanced Earth Observing Satellite |
| ADF | Anti Deflagration |
| ADINA | Automatic Dynamic Incremental Non linear Analysis |
| ADIT | Accumulated Deferred Income Taxes |
| ADP | Alternative Delivery Procedure |
| ADR | (European) Agreement concerning the international carriage of Dangerous goods by Road webpage |
| ADS | Air Diving Supervisor |
| Atmospheric Diving System | |
| ADT | Advanced Drilling Techniques |
| AE | Acoustic Emission |
| AED | Anti-Explosive Decompression |
| AES | Abrasive Engineering Society (USA) |
| AF | Arctic Floater |
| AFC | Approved For Construction |
| Alkaline Fuel Cell | |
| AFD | Approved For Design |
| AFE | Approved For Enquiry (or Expenditure) |
| AFEN | Atlantic Frontier Environment Network (UK) website |
| AFG | Association Française du Gas ( French Gas Association) |
| AFF | Active Fire Fighting |
| AFFF | Aqueous Film Forming Foam |
| AFM | Approved For Manufacture |
| AFNOR | Association Française de Normalisation (French Association for Normalisation) |
| AFP | Active Fire Protection |
| Approved For Purchase | |
| AFS | Arab Federation of Shipowners (also known as Arab Federation of Shipping - AFOS) |
| AFO | Axial Force Only |
| Aframax | tanker < 80,000 dwt (average freight rate assessment) |
| AFTP | French Association of Oil Techniciens and Professionals |
| AFUDC | Allowance for Funds Used During Construction |
| A&G | (Costs) Administrative & General overhead or expenses |
| AG | Above Ground |
| AGA | American Gas Association - website |
| AGC | Automatic Gain Correction |
| Automatic Generation Control | |
| AGCC | Arab Gulf Cooperation Council ( also known as CCASG and Arab Gulf Cooperation Council GCC) website |
| AGSO | Australian Geological Survey Organisation website |
| AGU | American Geophysical Union |
| AHJ | Authority Having Jurisdiction |
| AHU | Air Handling Unit |
| AHV | Anchor Handling Vessel |
| AHT | Anchor Handling Tug |
| AIChE | American Institute of Chemical Engineers website |
| AICVF | French Associations of Heating and Venting Engineers |
| AIIM | Association for Information and Image Management (USA) website |
| AIMS | Australian Institute of Marine Science website |
| AIP | Australian Institute of Petroleum |
| AIS | Analogue Input Safety |
| Air Insulated Switchgear | |
| Automatic Identification System | |
| AISC | American Institute of Steel Construction |
| AISE | Association of Iron and Steel Engineers (USA) website |
| AISI | American Iron and Steel Institute |
| AIT | Auto Ignition Temperature |
| AL | Appraisal Licence |
| ALARP | As Low As Reasonably Possible |
| ALD | Azimuthal Lithodensity Sensor (Trade Mark) |
| ALIVE | Autonomous Light Intervention Vehicle |
| AMCA | Air Movement and Control Association |
| AME | Agence Méditerranéenne de l'Environnement |
| AMJIG | Atlantic Margin Joint Industry Group (UK) website |
| AMNI | Associate Member of The Nautical Institute |
| AMORES | Azores Mid-Oceanic Ridge Ecosystem Studies |
| AMOSC | Australian Marine Oil Spill Centre |
| Amp | Ampere |
| AMR | Automated Meter Reading |
| AMSA | Australian Maritime Safety Agency(Australian Government) |
| AMT | Association for Manufactoring Technologie (USA) website |
| AMV | Automated Master Valve |
| Annulus Master Valve | |
| AMVER | Automated Mutual-Assistance Vessel Rescue (US Coast Guards) |
| aMW | Average Annual Megawatt or Average Megawatt |
| ANAIS | Analyse Interactive des Séries Temporelles ( french meaning) |
| ANP | Analogic Announciator Panel |
| Agencia Nacional de Petroleo (Brazil) website | |
| ANSI | American National Standard Institute |
| AOB | Any Other Business |
| AOCC | Aberdeen Operations Control Center |
| AOCS | American Oil Chemists Society website |
| AODC | Association Of Diving Contractors (ex : absorbed by IMCA) |
| Australian Oceanographic Data Centre website | |
| AOF | Absolute Open Flow (potential) |
| AOML | American Oceanographic and Meteorological Laboratory website |
| AOT | Advanced Oxidation Technology |
| AP | Abnormal Pressure |
| Annulus Pressure | |
| APA | Award of Predefined Areas |
| APAU | Accident Prevention Advisory Unit (of HSE) |
| APC | Advanced Process Control |
| APCD | Air Pollution Control District |
| APCE | Air Pollution Control Equipment |
| API | Air Pollution Index |
| American Petroleum Institute | |
| APIA | Australian Pipeline Industry Association website |
| APICOM | Association of Petroleum Industry Coop Managers website |
| APIRP | American Petroleum Institute Recommended Practice |
| APPA | African Petroleum Producers Association |
| APR | Applicable Prime Reference |
| APSAD | Assemblée Plénière des Sociétés d'Assurance Dommages |
| APT | Annulus Pressure Transducer |
| AQAP | Air Quality Attainment Plan |
| ARB | Air Resources Board (California) |
| ARCS | Admiralty Raster Chart Service |
| ARI | Air conditioning and Refrigeration Institute |
| ARIP | Accidental Release Information Program |
| ARPA | Automatic Radar Plotting Aid |
| ARPEL | Regional Association of Oil and Natural Gas Companies in Latin America and the Caribbean |
| ARQ | Automatic Repeat Request (protocol) |
| ARRC | Autonomous Rescue and Recovery Craft |
| Australian Resources Research Center website | |
| ARV | Air Relief Valve |
| AS | Air Supply |
| ASA | Acoustical Society of America (USA) website |
| ASBA | Association of Ship Brokers and Agents |
| ASC | Anti Surge Control |
| ASCC | Alaskan System Coordination Council (NERC Region) |
| ASCE | American Society of Civil Engineers (USA) website |
| ASCII | American Standard Code for Information Interchange webpage |
| ASCOPE | ASEAN Council on Petroleum |
| ASD | Allowable Stress Design |
| ASDB | Asian Development Bank |
| ASEAN | Association of South East Asian Nations |
| ASEG | Australian Society of Exploration Geophysicists |
| ASHRAE | American Society for Heating, Refrigeration and Air Conditioning Engineers |
| ASHRM | American Society for Healthcare Risk Management website |
| ASIS | American Society fo Industrial Security website |
| ASL | Above See Level |
| ASLI | Approximate Level of Impacts |
| ASME | American Society of Mechanical Engineers |
| ASNT | American Society for Non destructive Testing |
| ASP | Application Service Provider |
| ASQC | American Society for Quality Control (USA) website |
| ASR | Arc strike Report |
| ASRO | Australian Shipping Registration Office |
| ASSE | American Society of Safety Engineers (USA) website |
| ASSV | Annulus Subsurface Safety Valve |
| ASTM | American Society for Testing and Materials Followed by the letter of a committee (A,B,C,D,E, F,G,I or S) |
| ASTME | American Society of Tool and Manufacturing Engineers (now called SME) |
| ASU | Automatic Synchronising Unit |
| ASV | Annulus Swab Valve |
| Annular Safety Valve | |
| AT | Asymmetrical Unit |
| ATC | Available Transfer Capability |
| ATEX | Atmosphere Explosives |
| ATG | Association Technique de l'industrie du Gaz en France |
| ATM | Asynchronous Transfer Mode |
| ATP | Alberta Taciuk Process (oil sands and oil soaked recovery) |
| ATU | Administrative Teritorial Unit |
| ATV | All Terrain Vehicle |
| AUT | Automatic Ultrasonic Testing |
| AUV | Autonomous Underwater vehicle |
| AVM | Anti Vibration Mounting |
| AVO | Amplitude Variation with Offset |
| AVP | Advanced Vehicle technologies Programm |
| AVr | Amps Volt reactive |
| AVR | Automatic Voltage Regulator |
| AVV | Annulus Ventilation Valve |
| AW | Apparent Wind |
| AWG | American Wire Gauge |
| AWS | American Welding Society |
| AWV | Annulus Wing Valve |