| Acronym | Definition |
|---|
| RNA | Ribonucleic Acid |
| RNA | Research Natural Area |
| RNA | Royal Nepalese Army |
| RNA | Religion Newswriters Association |
| RNA | Ring No Answer |
| RNA | Radio Nacional de Angola (Angola National Radio) |
| RNA | Remote Network Access |
| RNA | Registered Nurse Anesthetist |
| RNA | Republic of New Africa |
| RNA | Retrospective Network Analysis |
| RNA | Registered Nursing Assistant (chiefly Canadian) |
| RNA | Remediation by Natural Attenuation (environmental cleanup) |
| RNA | Rochester Numismatic Association |
| RNA | Realtime Network Awareness (Sourcefire) |
| RNA | Restorative Nursing Aide |
| RNA | Réseau de Neurones Artificiels (French: Artificial Neural Network) |
| RNA | Rations Not Available |
| RNA | Risk Not Acceptable (insurance underwriting) |
| RNA | Risorse Naturali e Ambientali (Italian: natural and environmental resouces) |
| RNA | Royal Norwegian Army |
| RNA | Radio Network Association |
| RNA | Route Nouvelle Alsace (French rehabilitation management association; est. 1980) |
| RNA | Royal Netherlands Army |
| RNA | Robbery Not Armed (crime code) |
| RNA | Rotatable Nozzle Assembly |
| RNA | Routable Nozzle Assembly |
| RNA | Rough, Non-Capsulated, Avirulent (bacteria) |
| RNA | Registered Nurse Adult |
| RNA | Rotor Nacelle Assembly (wind turbine) |
| RNA | Resource Natural Area (land designation) |
| RNA | Redes Neuronales Artificiales (Spanish; Artificial Neural Network) |
| RNA | Royal Naval Association (UK) |
| RNA | Research Needs Assessment (process) |
| RNA | Royal Nepal Airlines (ICAO code) |
| RNA | Rassini NHK (Nippon Hatsujo- Kabushiki) Automotive (Brazil) |
| RNA | Royal Neighbors of America (fraternal benefit society) |