IAS may refer to:
Science
- Institute for Advanced Study, in Princeton, New Jersey, United States
 - Image Analysis & Stereology, the official journal of the International Society for Stereology & Image Analysis.
 - Iowa Archeological Society, United States
 - Iranian Arachnological Society, for the study of arachnids in Iran
 - International AIDS Society, an association of HIV/AIDS professionals
 - Institute of Agricultural Sciences, Banaras Hindu University, in India
 - Institute for Advanced Study at University of Minnesota in Minneapolis, Minnesota
 - Institute of Advanced Study (Durham) in Durham, North East England
 - IEEE Industry Applications Society
 
Government
- Indian Administrative Service, the Indian administrative civil service
 - Intergovernmental Affairs Secretariat (Canada)
 
Finance
Religion
Politics
- Institute for Anarchist Studies
 - Izquierda Asturiana, a political party in Spain
 - Immunisation Awareness Society, a New Zealand anti-vaccination group
 - International Aviation and Shipping emissions, specifically greenhouse gas emissions arising from those sectors (the term also used in the United Kingdom Climate Change Act 2008)
 
Aeronautics
- Indicated airspeed
 - Institute of Aerospace Sciences, in the United States
 - Institut aéronautique et spatial, in France
 - Iași International Airport, IATA designation for the airport in Iași, Romania
 - IAS Cargo Airlines, a British airline
 
Computing
- IAS machine, the first electronic computer built at the Institute for Advanced Study
 - Interactive Application System, a DEC PDP-11 operating system
 - Internet Application Server, alternate name for Oracle Application Server
 - Internet Authentication Service, a component of Windows Server
 
Other uses
- Instituto Ayrton Senna, an NGO in Brasil
 - Insulin autoimmune syndrome, a rare cause of reversible autoimmune hypoglycemia
 - Integral Ad Science, an American technology company that analyzes the value of digital advertisements
 - International American School of Warsaw, a preK–12 school in Poland
 - International Automated Systems, an American company
 - IAS Limited an Australian-based gambling company
 - Internal anal sphincter, human anatomy
 
See also
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