Acronyms
- Aberdeen Royal Infirmary, a tertiary referral hospital in Aberdeen, Scotland
- Acoustics Research Institute of the Austrian Academy of Sciences
- Acute respiratory infection
- Alcohol Related Illness
- Alternative for a Republic of Equals, now known as Civic Coalition ARI, a political party in Argentina led by Elisa CarriĆ³
- Alternative Routing-ID Interpretation, an extension to the PCI Express computer input/output standard that supports the virtual machine computing model
- American Refrigerant Institute, a trade association in North America
- Aries (constellation), a constellation which has the standard astronomical abbreviation Ari
- Arizona Diamondbacks
- Arthur Rylah Institute for Environmental Research, an organization conducting environmental research in Victoria, Australia
- Artist-run initiatives
- Associazione Radioamatori Italiani, an amateur radio organization in Italy
- Astronomisches Rechen-Institut, an institute based in Heidelberg, Germany
- Autofahrer-Rundfunk-Informationssystem, a system formerly used in Germany to indicate traffic announcements on FM radio broadcasts
- Automated Readability Index, a readability algorithm
- Avicenna Research Institute, an Iranian biotechnology research institute
- Ayn Rand Institute, an organization devoted to exposition of Ayn Rand's philosophy, Objectivism
- Automatic Resource Inclusion, the behaviour of Google Web Toolkit which lets it automatically calculate resource files necessary for including into the deployment.
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