| Acronym | Definition |
|---|
| ARN | Auburn (Amtrak station code; Auburn, CA) |
| ARN | Ácido Ribonucleico (Spanish: Ribonucleic Acid) |
| ARN | Access Research Network |
| ARN | Amazon Resource Name |
| ARN | Advanced Remote Node |
| ARN | Acide Ribonucléique (French: RNA) |
| ARN | Application Reference Number |
| ARN | Association of Rehabilitation Nurses |
| ARN | Autoridad Regulatoria Nuclear (Argentina) |
| ARN | Alien Registration Number (US Citizenship & Immigration Services) |
| ARN | Acute Retinal Necrosis (fast death of the retina) |
| ARN | Aviation Reference Number (Civil Aviation Safety Authority; Australia) |
| ARN | Appui Réversible Normalisé (French: Reversible Standardized Support; limestone production) |
| ARN | American Rugby News |
| ARN | Additional Reference Number |
| ARN | Actions Réseaux Numériques (French: Shares Digital Network; est. 1998) |
| ARN | Stockholm, Sweden - Arlanda International (Airport Code) |
| ARN | Animal Rights Network |
| ARN | Arabian Reseller News |
| ARN | Animal Reference Number (data) |
| ARN | Aeronautical Radio Navigation |
| ARN | Aménagement et Risques Naturels (French: Planning and Natural Risks; French Bureau of Geological and Mining Research) |
| ARN | Alabama Radio Network |
| ARN | Account Reference Number (finance) |
| ARN | Alliance pour la Résistance Nationale (French: Alliance for National Resistance; est. 2001) |
| ARN | Alternate Reference Number |
| ARN | Adjunct Routing Number (AT&T) |
| ARN | Auction Rate Note (finance) |
| ARN | Acquirer Reference Number (account tracking) |
| ARN | Alteration Request Number |
| ARN | Air Request Network |