English abbreviations from rnli to ro
- RNLI (Royal National Lifeboat Institution)
- RNLTD (Report No Later Than Date)
- RNM (Resource Needs Model)
- RNN (Bornholm Airport)
- RNNC (Rye Newcomers and Neighbors Club)
- RNNS (Royal Naval Nursing Service)
- RNO (Reno-Tahoe International Airport)
- RN of A (Royal Neighbors of America)
- RNP (Required navigation performance)
- RNPS (Radio Network Planning System)
- RNR (Recovery Net Radio)
- RNRF (Renewable Natural Resources Foundation)
- RNS (St. Jacques Airport)
- RNT (RNT Log)
- RNVC (Reference Number Variation Code)
- RNVR (Royal Navy Volunteer Reserve)
- RNW (Resolutions NorthWest)
- RNX (Richard Nakka Experimental Rocket Propellant)
- RNX-62 (Epoxy Composite Propellant)
- RNY (Runway)
- RNZ (Radio New Zealand)
- RNZAF (Royal New Zealand Air Force)
- RNZI (Radio New Zealand International)
- RNZN (Royal New Zealand Navy)
- RO (Royal Ordnance)