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 Arizona Cardinals of the National Football League Arizona Diamondbacks of Major League Baseball Arizona Coyotes of the National Hockey League Autofahrer-Rundfunk-Informationssystem, former German radio traffic broadcasts Automated Readability Index See also Ari (disambiguation)