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Alternating current, a type of electric current

Actinium (Ac), a chemical element

Acetaldehyde (also Ac), an organic ion

Acetate (also Ac), an organic ion

Anterior commissure, a small bundle of nerve fibers that connect the right and left temporal lobes

Anticipated Convection, the code for severe thunderstorm forecasts issued daily for the contiguous U.S. by the Storm Prediction Center

Armored Cable, a type of power cable used by electricians

attocoulomb (aC), an SI unit of electric charge

Axiom of choice, a mathematical set theory concept

Accessory cells, used in cell cultures

Acromioclavicular joint in humans and other animals, frequently injured in sport

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Antigua and Barbuda, an obsolete NATO digram

Ascension Island, an island in the South Atlantic Ocean (ISO 3166-1 country code)

Atlantic City, New Jersey

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.ac, Internet top-level domain name for Ascension Island

.ac (second level), Internet second-level domain used to denote academic institutions in many countries

Anonymous Coward, in the Slashdot online environment

Authorization certificate or attribute certificate, a digital permission to use a service or resource

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AC Schnitzer, an aftermarket tuner of BMW automobiles

AC Cars, a brand of automobile

AC Cobra, an Anglo-American sports car

Hyundai Aero City, a bus built by the Hyundai Motor Company

Air Canada, as its IATA airline designator

Aircraft (usually A/C)

Algoma Central Railway, a now out-of-service railway in Northern Ontario, Canada

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Aircraftman

Assistant Commissioner

Assistant Commissioner of Police of the Metropolis

Companion of The Order of Australia, the highest rank appointed by The Order.

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Aleister Crowley, in "magickal" contexts

Alan Cox, Linux kernel developer

Austin Carr, former NBA player

A.C. Green, former NBA player

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AC Milan, an Italian football club

Athletic Club

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AC/DC, a rock group

Adult contemporary music, a music genre also used to describe broadcast radio stations

Animal Collective, an experimental music band

Anal Cunt, a grindcore band.

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Aezhumazhai vs Chitra, a forthcoming tamil film.

The name of the ultimate computer at the end of time in Isaac Asimov's The Last Question

After Colony, an alternate timeline in the Gundam metaseries for the universe of Gundam Wing

"Alt Cataclius" or "After Cataclysm", a historical era in the timeline for the Dragonlance fictional universe

Animal Crossing, a real-time village video game for the Nintendo Game Cube and Nintendo DS

Assassin's Creed, an upcoming platformer/stealth game for the PC, Xbox 360, and PS3

Armor Class, a combat-related parameter in the Dungeons & Dragons role playing game system

A robotic fighter that is under the player's control in the video game series Armored Core

Asheron's Call, a fantasy game in the massively multiplayer online role-playing (MMORPG) genre

Final Fantasy VII: Advent Children

Accurentum, a fictional chemical element from Star Trek

Ace Combat

Arthur Curry, who goes by his initials during an appetance on Smallville (TV series)

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Akademikernes Centralorganisation, the Danish Confederation of Professional Associations

Civic Alliance, a Romanian NGO

Astronomy club, common in schools and tertiary institutions

Ad Council

Japan Ad Council

Ayala Corporation, via its ticker symbol "AC"

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Ac, another name for the Ansuz rune

Air conditioning (and air conditioner), the mechanical process of cooling air in enclosed spaces

Ante Christum, Latin for "before Christ"

Anthrocon, a furry fandom convention

Antichrist, in the Christian religion

Associación Civil, a title for non profit organizations in Spain

Atlantic College, one of the ten United World Colleges

Member of the National Assembly for Wales

Average cost in economics

Assessment Centre in Human Resources

Alpha Centauri

Across Corners on technical drawings.

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List of people by name: Ac