| Acronym | Definition |
|---|
| RO➣Romania |
| RO➣Radio |
| RO➣Removal of (medical) |
| RO➣Run on (proofreading) |
| RO➣Reverse Osmosis |
| RO➣Right On |
| RO➣Ride-On (Montgomery County, Maryland transit provider) |
| RO➣Ragnarok Online (computer game) |
| RO➣Royal Oak (Michigan City, MI, USA) |
| RO➣Read Only |
| RO➣Regional Office |
| RO➣Rule Out |
| RO➣Rollover (financial) |
| RO➣Rovigo (Italy) |
| RO➣Readout |
| RO➣Reorder (proofreading) |
| RO➣Rondônia (Brazilian state) |
| RO➣Restraining Order |
| RO➣Reliability of Operations |
| RO➣Reverse Order |
| RO➣Remains Open |
| RO➣Radio Operator |
| RO➣Red Orchestra (computer game) |
| RO➣Registered Owner |
| RO➣Reserve Officer |
| RO➣Record Only |
| RO➣Revenue Officer |
| RO➣Responsible Officer |
| RO➣Research Only |
| RO➣Research Objective |
| RO➣Rough Opening (construction) |
| RO➣Room Only (hotel) |
| RO➣Rock Opera |
| RO➣Renewables Obligation (UK) |
| RO➣Repair Order |
| RO➣Ruimtelijke Ordening (Dutch: spatial development) |
| RO➣Risk Officer |
| RO➣Russian Orthodox |
| RO➣Radiation Oncologist |
| RO➣Robust Optimization |
| RO➣Required One-Time |
| RO➣Ranking Officer |
| RO➣Receptor Occupancy (pharmacology) |
| RO➣Routine Order (Canadian Military) |
| RO➣Reporting Officer |
| RO➣RingOut |
| RO➣Retired Officer (UK) |
| RO➣Remote Operations |
| RO➣Rescue Officer |
| RO➣Remote Office |
| RO➣Tarom Romanian Air Transport (IATA airline code) |
| RO➣Recherche Opérationnelle (French: Operations Research) |
| RO➣Radar Operator |
| RO➣Recognized Organization (various countries) |
| RO➣Registration Officer |
| RO➣Receive Only |
| RO➣Request Order |
| RO➣Reactor Operator |
| RO➣Requested Off (work schedule) |
| RO➣Royal Observatory |
| RO➣Regnum Online (video game) |
| RO➣Revenue Outturn (UK) |
| RO➣Restriction Orifice (device used to drop pressure in a pipe) |
| RO➣Resident Office |
| RO➣Reviewing Official |
| RO➣Requirements Officer |
| RO➣Residence Order |
| RO➣Raphe Obscurus |
| RO➣Range Only (sonobuoy, AN/SSQ-47) |
| RO➣Route Order |
| RO➣Régime Obligatoire (French: Required Plan; health care) |
| RO➣Relay Operator |
| RO➣Rate Offset |
| RO➣Right Outboard |
| RO➣Requirements Objective |
| RO➣Requisitioning Objective |
| RO➣Radiological Officer |
| RO➣Regional Operation (various organizations) |
| RO➣Rotate Out (Hyper Logo Turtle Graphics command) |
| RO➣Redistribution Order |
| RO➣Rutas Orientales (Spanish: Eastern Routes) |
| RO➣Routing Office (US Navy) |
| RO➣Regrets Only (invitation response) |
| RO➣Réponse Objective (French) |
| RO➣Registered Optician |
| RO➣Reportable Occurrence |
| RO➣Resistive Open |
| RO➣Routing Organisation |
| RO➣Report Orderly |
| RO➣US Revenue Private Die Proprietary (Scott Catalogue prefix; philately) |