| Acronym | Definition |
|---|
| RNO➣Riku Niemi Orchestra (Finnish orchestra) |
| RNO➣Run-Off File |
| RNO➣Russian National Orchestra |
| RNO➣Rusty Nuts Originals (vehicle club) |
| RNO➣Réseau National d'Observation de la Qualité du Milieu Marin (French: National Network for Observation of Marine Coastal Environmental Quality) |
| RNO➣Radio Network Optimization |
| RNO➣Race National Origin (EEO) |
| RNO➣Religious News Online |
| RNO➣Rosettanet Object |
| RNO➣Resident Naval Officer |
| RNO➣Recipient Network Operator (mobile communications operator) |
| RNO➣Republican in Name Only |
| RNO➣Reaction Natural Orbital |
| RNO➣Responsive NASA Official |
| RNO➣Reno, NV, USA - Reno/Tahoe International Airport (airport code) |
| RNO➣Répertoire National des Ostéopathes (French: National Register of Osteopaths) |
| RNO➣Regional Nuclear Option (US DoD) |
| RNO➣Real National Output |
| RNO➣Reactive Nitrogen Oxides |