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Look up aos in Wiktionary, the free dictionary.

AOS, Aos or AoS may refer to:

Military, police and government

Armed Offenders Squad, a branch of the New Zealand Police
Armed Offenders Squad (Victoria), a disbanded branch of the Victorian Police in Australia
Amook Bay Seaplane Base (IATA code AOS)
Adjustment of status, an immigration concept in the United States

Academy of the Sierras, boarding schools devoted to weight loss
The Alice Ottley School, Worcester, England
AO Springfield School, Worcester, England
Associate of Occupational Studies, a two-year college degree
Annunciation Orthodox School, a Greek Orthodox private school in Houston, Texas
Loudoun Academy of Science, a high school STEM program in Loudoun County, Virginia

Accessory olfactory system, a second sense of smell in some animals
Accounting, Organizations and Society, an academic journal
Acquisition of signal, in spacecraft communications
Agricultural Ontology Service
American Oriental Society, a learned society
American Ornithological Society
Angle of sideslip
Apraxia of speech, a speech sound disorder
Area of Search, a geographical region used in the selection of Sites of Special Scientific Interest in the UK
Adams–Oliver syndrome, a congenital disorder

Agents of S.H.I.E.L.D., an American television series set in the Marvel Cinematic Universe
Ace of Spades (video game)
Ace of Spades HQ, a political blog
Aeon of Strife, an early multiplayer online battle arena (MOBA)
Age of Sail (computer game)
- Age of Sail II, its sequel
Castlevania: Aria of Sorrow, a game for the Game Boy Advance
"AOS" (song), 1970, by Yoko Ono, featuring Ornette Coleman
All-Out Sundays, a Philippine GMA Network Sunday variety show
Warhammer Age of Sigmar, a tabletop wargame

Academic Operating System, a version of 4.3 BSD Unix for the IBM RT
Algebraic operating system, an input method used on many Texas Instruments calculators
AmigaOS
Apple Online Store, the retail web site for Apple Inc.
Array of structures, an interleaved data format
Data General AOS (Advanced Operating System)
A2, an operating system formerly named Active Object System (AOS)
Fedora AOS (Appliance Operating System), a small version of the Fedora Linux project
aos or AOS, acronym of "anonymous operating system", an earlier name for the operating system Whonix