AQ, Aq, aQ, or aq may stand for or refer to:
Geography
- American Samoa, the DAFIF 0413 / DIA 65-18 / FIPS PUB 10-4
- Antarctica, ISO 3166-1 country code
- L'Aquila, a province of Italy
- Aq, alternate name of Ak, Buin Zahra, a village in Iran
Science
- Adaptive quantization, a quantization process that provides efficient compression
- Anthraquinone, an aromatic organic compound
- Aqueous solution, dissolved in water
- The Autism Spectrum Quotient, a test for autism spectrum conditions in adul
Other
- Acquity Group stock symbol (NYSE: AQ)
- Academic Quadrangle, a landmark building of Simon Fraser University
- AdventureQuest, an online RPG by Artix Entertainment
- Al-Qaeda, an Islamic terrorist group
- Alliance Quebec, a Canadian lobbyist group for English-speaking Quebecers
- Aloha Airlines, former IATA code for the defunct airline
- Aloha Air Cargom IATA code
- Australian Quarterly, an Australian political science journal
- Automatic Qualifying conference, an NCAA athletic conference with an automatic berth in a Bowl Championship Series game
- Oracle Advanced Queuing, a message provider used in the software products of the Oracle Corporation
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