| Acronym | Definition |
|---|
| ATC | Air Traffic Control |
| ATC | Average Total Cost |
| ATC | Artist Trading Card |
| ATC | Air Training Corps (United Kingdom and Australia) |
| ATC | Certified Athletic Trainer |
| ATC | Automatic Tool Changer |
| ATC | Automatic Temperature Compensation |
| ATC | Applied Technology Council |
| ATC | Appalachian Trail Conservancy (formerly Appalachian Trail Conference) |
| ATC | Agreement on Textiles and Clothing |
| ATC | Automatic Temperature Control |
| ATC | All Things Considered (National Public Radio show) |
| ATC | At the Center (Hartford, Maine retreat center) |
| ATC | Automatic Transmission Control |
| ATC | Around The Clock |
| ATC | Automatic Train Control (rail signaling systems) |
| ATC | Athletic Trainer, Certified |
| ATC | Air Training Command (USAF; now Air Education and Training Command, AETC) |
| ATC | Air Transport Command |
| ATC | Ancillary Terrestrial Component (FCC) |
| ATC | American Technology Corporation |
| ATC | Appalachian Trail Conference (now Appalachian Trail Conservancy) |
| ATC | Automatic Traction Control |
| ATC | American Tower Corporation |
| ATC | American Turkish Council |
| ATC | Australian Transport Council |
| ATC | Athens Technical College (Georgia) |
| ATC | Australian Tourist Commission (now Tourism Australia) |
| ATC | Astronomy Technology Centre (Edinburgh, Scotland) |
| ATC | Applied Technology Center |
| ATC | Air Tanzania (ICAO code) |
| ATC | Aviation Training Center |
| ATC | Arthurs Town, Bahamas (Airport Code) |
| ATC | Authorized Testing Center |
| ATC | American Transmission Company LLC (Waukesha, WI) |
| ATC | Authority to Construct |
| ATC | Anaplastic Thyroid Carcinoma |
| ATC | Advanced Transfer Cache |
| ATC | Asociación de Trabajadores del Campo (Farm Workers Association, Nicaragua) |
| ATC | Alcohol and Tobacco Control (Louisiana) |
| ATC | Available Transmission Capacity |
| ATC | Automotive Training Center (Exton, Pennsylvania) |
| ATC | Army Training Center |
| ATC | Afghan Technical Consultants (Kabul, Afghanistan) |
| ATC | Atlantic Theater Company (New York, New York) |
| ATC | Area Traffic Control (London, UK) |
| ATC | Alcohol Treatment Center |
| ATC | Austin Technology Council |
| ATC | Armored Troop Carrier |
| ATC | Any Two Cards (poker card game) |
| ATC | Argentina Televisora Color (public television network former name) |
| ATC | Anatomical Therapeutic Classification |
| ATC | Agence du Tourisme de la Corse (French: Corsica Tourism Agency) |
| ATC | All Terrain Crane |
| ATC | Azienda Trasporti Consorziali (Bologna, Italy) |
| ATC | Arizona Technology Council |
| ATC | AirTouch Communications |
| ATC | Anti-Terrorist Court (Pakistan) |
| ATC | Assurance Technology Corporation |
| ATC | Adventure Training Camp |
| ATC | All Terrain Cycle |
| ATC | Authority to Connect |
| ATC | Automatic Traffic Counter (UK) |
| ATC | Alternative Technology Centre (Hebden Bridge, UK) |
| ATC | Aromatics Thailand Public Company Limited |
| ATC | Automated Toll Collection |
| ATC | Ask the Chief (various organizations) |
| ATC | Appalachian Technical College |
| ATC | Air Threat Conference (US DoD) |
| ATC | Australian Tax Cases (Australia) |
| ATC | American Television & Communications |
| ATC | Automatic Target Cueing |
| ATC | Air Travel Card (airlines) |
| ATC | Air Transportable Clinic |
| ATC | air transportable clinic (USAF) |
| ATC | Assurance Technology Center (NASA) |
| ATC | Area Training Center |
| ATC | Ácido Tricloroacético (Portugese) |
| ATC | Air Target Chart |
| ATC | American Thermoplastic Company |
| ATC | Chief Aviation Electronics Technician (Naval Rating) |
| ATC | Application Transaction Counter |
| ATC | Alpine Tourist Commission |
| ATC | Automatic Threshold Control |
| ATC | Absolute Time Command |
| ATC | American Telecommunications Company, Inc. |
| ATC | Alternative Technical Concept (US DOT) |
| ATC | Aluminum Technology Centre (Canada) |
| ATC | Advanced Technology Council |
| ATC | Additives Technical Committee (Petroleum Additive Manufacturers in Europe) |
| ATC | Affordability Through Commonality |
| ATC | Ancillary Time Code |
| ATC | Access Tandem Code |
| ATC | Affordable Travel Club (Gig Harbor, WA) |
| ATC | Adiabatic Toroidal Compressor |
| ATC | Adaptive Transform Coder |
| ATC | Automatic Target Classification |
| ATC | Absolute Time Code (video and audio postproduction) |
| ATC | Mini-Armored Troop Carrier |
| ATC | AEGIS Training Center |
| ATC | Automatic Transfer Case (General Motors) |
| ATC | Active Transfer Case (Magna International Inc.) |
| ATC | American Tournai Club (automobile club; Belgium) |
| ATC | Actual Time to Count (shipping) |
| ATC | Alien Tuning Club (automobile club; France) |
| ATC | Association Tunisienne de Chirurgie |
| ATC | Auto Test Center (Consumers Union) |
| ATC | Applications Techniques et Commerciales (French: Technical and Commercial Applications) |
| ATC | ALLBASE/Turbo Connect |
| ATC | Authorization To Copy |
| ATC | Automated Technical Control |
| ATC | Acute Toxicity Class |
| ATC | Ammunition Team Chief |
| ATC | Associazione Ticinese dei Chimici (Association of Chemical Ticinese; now dissolved) |
| ATC | Air Tactical Communications |
| ATC | Analog Traffic Channel |
| ATC | Anurag Tyagi Classes (India) |
| ATC | Additional Trunk Capacity (ITU-T) |
| ATC | Alliance for Technology Commercialization, Inc. |
| ATC | Anti-Tank Cannon |
| ATC | Allowance Type Code |
| ATC | Assessment Training Centre |
| ATC | Association des Travailleurs Agricoles (Agricultural Workers' Association) |
| ATC | Aquaculture Technology Centre (University of Stirling, UK) |
| ATC | Active Trouble Code |
| ATC | Aircraft Test Committee |
| ATC | Aeration Tank Concentration (wastewater treatment) |
| ATC | Aided Target Classification |
| ATC | Army Tactical/Transportation Command |
| ATC | Assistant Test Controller |
| ATC | Aerospace Tool Corporation |
| ATC | Advanced Thermoplastic Composite |
| ATC | Audio Teleconferencing Center |
| ATC | Agri and Co-operative Training and Consultancy Services |
| ATC | Accounting Tuition Centre |
| ATC | Airport Transfer Center (US Postal Service) |
| ATC | Advancement to Candidacy (various schools) |
| ATC | American Theater Company (various locations) |
| ATC | Authority to Carry (various locations) |
| ATC | A Touch of Class (band) |
| ATC | Alcoa Technical Center (Pennsylvania) |
| ATC | Active Thermal Control |
| ATC | Aberdeen Test Center |
| ATC | Acronyme en Trois Lettres (French: Three Letter Acronym) |
| ATC | Advance To Contact |
| ATC | Advanced Technology Center |
| ATC | Advanced Telecommunications Corporation |
| ATC | Advanced Technical Center |
| ATC | American Tobacco Company (est. 1890) |
| ATC | Achilles Track Club |
| ATC | American Textbook Council (est. 1988; New York) |
| ATC | Ahn Taekwondo Columbus (Columbus, OH) |
| ATC | Adoption Tax Credit |
| ATC | 4-Amino-1,2,4-Triazole (nitrification inhibitor) |
| ATC | Advanced Technology Consulting (Mason, OH) |
| ATC | Advanced Technical Ceramics (Corporation) |
| ATC | Authorization to Close (finance) |
| ATC | Alberdingk Thijm College (Hilversum, Netherlands) |
| ATC | Australian Technical College |
| ATC | Approval to Construct (various locations) |
| ATC | After the Crisis |
| ATC | Above the Clouds |
| ATC | Across the Curriculum (academics) |
| ATC | Artesian Technology Corporation (Ossining, NY) |
| ATC | Area Teaching Committee (various locations) |
| ATC | Access to Carrier (Nortel) |
| ATC | Autonomic and Trusted Computing (conference) |
| ATC | American Transplant Congress |
| ATC | Advanced Telecommunications Component |
| ATC | All Things Cedar (furniture) |
| ATC | Art, Technology and Culture Colloquium (University of California, Berkeley) |
| ATC | Acoustic Transducer Company (loudspeakers; various locations) |
| ATC | Address Translation Cache |