AAC

AAC may refer to:

Aviation

 * Advanced Aircraft, a company from Carlsbad, California
 * Alaskan Air Command, a radar network
 * American Aeronautical Corporation, a company from Port Washington, New York
 * American Aviation, a company from Cleveland, Ohio
 * Amphibian Airplanes of Canada, a company from Squamish, British Columbia
 * El Arish International Airport's IATA code
 * Civil Aviation Authority (El Salvador) (Autoridad de Aviación Civil)
 * Civil Aviation Authority (Panama) (Autoridad Aeronáutica Civil)

Education

 * Anthony Abell College, a secondary school in Brunei
 * Art Academy of Cincinnati, a private college
 * Association of American Colleges known today as the American Association of Colleges and Universities
 * Coimbra Academic Association, a Portuguese students' union

Military

 * Anti-Aircraft Warfare
 * Advanced Armament Corporation, manufacturer of sound suppressors
 * Airborne aircraft carrier, a type of aircraft
 * United States Army Acquisition Corps
 * United States Army Air Corps, a former component of the United States Army
 * Army Air Corps (United Kingdom), a component of the British Army
 * Army Apprentices College, a former UK college
 * Australian Air Corps, immediate predecessor of the Royal Australian Air force
 * Australian Army Cadets, a youth organisation

Organizations

 * Adult Association of Canada, a coalition of strip club owners and their agents
 * Affirming Anglican Catholicism, a religious movement
 * Alameda Arts Council
 * American Anglican Council, a religious organization
 * Australian Agricultural Company, a company
 * Australian Aluminium Council, an industry association

Sports

 * American Airlines Center, a multipurpose arena in Dallas, Texas
 * American Alpine Club, a climbing organization
 * American Athletic Conference, an NCAA college conference made up of primarily Big East Conference teams before 2013
 * Appalachian Athletic Conference, an NAIA college athletics conference
 * Western North Carolina Athletic Conference, a high school organization known as the Appalachian Athletic Conference until 2009
 * Asia-Pacific Amateur Championship, formerly Asian Amateur Championship, an APGC golf tournament
 * Associação Académica de Coimbra – O.A.F., a Portuguese football organization
 * Associação Académica de Coimbra – basketball, a Portuguese basketball club
 * Associação Académica de Coimbra – volleyball, a Portuguese volleyball club
 * Associação Académica de Coimbra, the students' union of the University of Coimbra, which sponsors other sports, including rugby
 * Association of Alabama Camps, a youth camp organization
 * Atlanta Athletic Club, a private athletic club in Duluth, Georgia
 * Audax Alpine Classic, a bicycle event in Victoria, Australia

Technology

 * Advanced Audio Coding, an audio compression format, with the .aac file extension
 * Air arc cutting, a gouging process for metals
 * Auto Avio Costruzioni 815, a car by Ferrari
 * Autoclaved aerated concrete, a building material
 * Photochrom, also known as the Aäc process

Other uses

 * Anesthesiologist assistant (sometimes abbreviated AA-C), an assistant to an anesthesiologist
 * Anne Arundel County, Maryland
 * Antimicrobial Agents and Chemotherapy, an academic journal
 * Ari language (New Guinea), coded aac in ISO 639-3
 * Augmentative and alternative communication, a class of communications methods for people with speech impairments
 * Pseudomembranous colitis, also known as antibiotic associated colitis, a medical complication
 * AAC, a codon for the amino acid asparagine
 * Adenine nucleotide translocator (ANT), also known as the ADP/ATP carrier protein (AAC)