ARI may refer to:
Organizations
- Acoustics Research Institute of the Austrian Academy of Sciences
 - Civic Coalition ARI, a political party in Argentina
 - American Refrigerant Institute, North America
 - Angel Resource Institute
 - Arthur Rylah Institute for Environmental Research, Victoria, Australia
 - Associazione Radioamatori Italiani, Italian amateur radio association
 - Astronomisches Rechen-Institut, an institute based in Heidelberg, Germany
 - Astrophysics Research Institute, Merseyside, England
 - Autism Research Institute
 - Avicenna Research Institute, an Iranian biotechnology institute
 - Ayn Rand Institute, promoting Objectivism
 
Other uses
- Chacalluta International Airport in Arica, Chile (IATA code)
 - Aberdeen Royal Infirmary, Scotland
 - Acute respiratory infection
 - Adjusted Rand Index, a clustering metric
 - A common abbreviation for the U.S. state of Arizona and its major professional sports teams
 - Autofahrer-Rundfunk-Informationssystem, former German radio traffic broadcasts
 - Automated Readability Index
 
See also
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