| Acronym | Definition |
|---|
| RIO➣Rio De Janeiro, Rio De Janeiro, Brazil (Airport Code) |
| RIO➣Risk, Issues, and Opportunities (various locations) |
| RIO➣Remote Input Output |
| RIO➣Reference Identifier Object |
| RIO➣Ram Input Output |
| RIO➣Rock in Opposition (musical genre) |
| RIO➣Radar Intercept Officer |
| RIO➣RapidIO (Interconnect Architecture) |
| RIO➣Regionaal Indicatie Orgaan (Dutch: Regional Indication Body; health care) |
| RIO➣Rimonabant in Obesity |
| RIO➣Reconfigurable Input/Output |
| RIO➣Reference Interconnection Offer |
| RIO➣Restore Iraqi Oil (US Army mission) |
| RIO➣Reintegration of Offenders |
| RIO➣Remote Input/Output |
| RIO➣Right, I'm Off |
| RIO➣Research Innovation Office (various locations) |
| RIO➣Régie des Installations Olympiques |
| RIO➣Reusable Information Object |
| RIO➣Reshaping the International Order (book) |
| RIO➣Regional Information Officer (USACE) |
| RIO➣Retirement Income Option (various organizations) |
| RIO➣Relevé d'Identité d'Opérateur (French: Statement of Identity Operator) |
| RIO➣Resampled Inference of Orthologs |
| RIO➣Remote Infrastructure Operations |
| RIO➣Réseau Intertropical d'Ordinateurs (French: Intertropical Network of Computers) |
| RIO➣Research Instruction Online |
| RIO➣Reverse Implied Odds (Poker) |
| RIO➣Reverse Implement Option (riding lawnmowers) |
| RIO➣Roma Initiatives Office (Open Society Institute) |
| RIO➣Random Insanity Online (website) |
| RIO➣Resolution Independent Object(s) |
| RIO➣Reporting In & Out |
| RIO➣Ribbonized Organized Integrated (aircraft wiring) |
| RIO➣Regional Inspection Officer (India) |
| RIO➣Random Early Discard with In/Out (algorithm) |
| RIO➣Remote Inside Option (Compaq) |
| RIO➣Realistic Input/Output Opportunity |