- AC stands for Aachen (Germany)
- AC stands for Abdominal Circumference (obstetrics)
- AC stands for Aberdeen College
- AC stands for Absorption Chiller
- AC stands for Academic Complex
- AC stands for Academic Institution (DNS zone for UK academic institutions; as in .ac.uk)
- AC stands for Acceleration (Front Page Sports Football ’95 et al)
- AC stands for Accept (ITU-T)
- AC stands for Acceptance Criteria
- AC stands for Access Card
- AC stands for Access Category
- AC stands for Access Channel
- AC stands for Access Control
- AC stands for Access Customer
- AC stands for Acción Ciudadana (Spanish: citizen action; Guatemala)
- A/C stands for Account
- AC stands for Account Code (Sprint BCS-29)
- AC stands for Account Control
- AC stands for Account Current
- AC stands for Accountancy
- AC stands for Accounting Clerk
- AC stands for Ace Combat (video games 1-5)
- Ac stands for Acetyl Group (chemistry)
- AC stands for Acoustic Coupler
- AC stands for Acquisition Center
- AC stands for Acre (state of Brazil)
- AC stands for Acromioclavicular (shoulder joint)
- AC stands for Actinium
- AC stands for Action Code
- AC stands for Action for Change (Mauretania)
- A/C stands for Activated Carbon
- AC stands for Activated Charcoal
- AC stands for Active Component
- AC stands for Actual Cost
- AC stands for Actual Count
- AC stands for Acute
- AC stands for Adapter Card (FS-1037c)
- AC stands for Added Copy (libraries)
- AC stands for Adenylate Cyclase
- AC stands for Adjacent Channel
- AC stands for Adjudicator
- AC stands for Administrative Control
- AC stands for Admirals Club
- AC stands for Adult Contemporary (radio format)
- AC stands for Advanced Catalyst (research team; Japan)
- AC stands for Advanced CMos
- AC stands for Advanced Computing
- AC stands for Advent Children (movie sequel to Final Fantasy VII game)
- AC stands for Advent Christian
- AC stands for Advisory Circular (aviation)
- AC stands for Advisory Committee
- AC stands for Advocacy Center
- AC stands for Aero Club
- AC stands for Affinity Chromatography
- AC stands for African Caribbean
- AC stands for After Christ
- AC stands for After Class
- AC stands for After Colony
- AC stands for After Colony (Gundam Wing animated series)
- AC stands for After Coupon
- AC stands for Age Concern (UK)
- AC stands for Agent Code
- AC stands for Agir Ensemble Contre le Chômage (Paris, France)
- AC stands for Air Cadets
- AC stands for Air Canada (airline code)
- AC stands for Air Cargo
- AC stands for Air Carrier
- AC stands for Air Change
- AC stands for Air Combat (game)
- AC stands for Air Commodore
- AC stands for Air Compressor
- A/C stands for Air Conditioning
- AC stands for Air Conduction
- AC stands for Air Controller
- AC stands for Air Corps
- AC stands for Air Curtain
- AC stands for Air Traffic Controller (USN Rating)
- AC stands for Air-Cooled
- AC stands for Aircraft
- A/C stands for Aircraft
- AC stands for Aircraft Carrier
- AC stands for Aircraft Commander
- A/C stands for Aircraft Commander
- AC stands for Aircraftman
- A/C stands for Airing Cupboard
- AC stands for Akademikernes Centralorganisation
- AC stands for Alameda County
- AC stands for Alan Cox (Linux kernel hacker)
- AC stands for Albion College (Albion, MI)
- AC stands for Alcohol Concentration
- AC stands for Aleister Crowley (novelist)
- AC stands for Algorithmic Complexity
- AC stands for Alice Cooper (musician)
- AC stands for Alicyclic
- AC stands for Alignment Check
- AC stands for All Clear
- AC stands for Allergic Conjunctivitis
- AC stands for Allied Command
- AC stands for Allis Chalmers (manufacturer of agriculture and industrial equipment)
- AC stands for Alpha Centauri (game)
- A/C stands for Alternating Current
- AC stands for Alternating Current (electricity; physics)
- AC stands for Alternative Certification (teaching)