| 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 |