ARI

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