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RORun on (proofreading)
RORoyal Oak (Michigan City, MI, USA)
RORule Out
RORovigo (Italy)
RORondônia (Brazilian state)
RORoom Only (hotel)
RORuimtelijke Ordening (Dutch: spatial development)
RORussian Orthodox
ROTarom Romanian Air Transport (IATA airline code)
RORecherche Opérationnelle (French: Operations Research)
ROReceive Only
RORoyal Observatory
RORange Only (sonobuoy, AN/SSQ-47)
RORégime Obligatoire (French: Required Plan; health care)
RORegional Operation (various organizations)
RORotate Out (Hyper Logo Turtle Graphics command)
RORegrets Only (invitation response)
RORéponse Objective (French)
RORegistered Optician
ROReportable Occurrence
ROResistive Open
RORouting Organisation
ROReport Orderly
ROUS Revenue Private Die Proprietary (Scott Catalogue prefix; philately)
ROReviewing Official
RORemote Operations
RORescue Officer
ROReserve Officer
RORelay Operator
RORobust Optimization
RORemote Office
RORequested Off (work schedule)
RORequired One-Time
RORequirements Officer
RORegistered Owner
RORepair Order
RORestraining Order
ROReorder (proofreading)
RORate Offset
ROReactor Operator
RORead Only
RORoute Order
RORoutine Order (Canadian Military)
RORadio Operator
RORedistribution Order
RORegional Office
ROReporting Officer
RORequirements Objective
RORequisitioning Objective
ROResearch Objective
ROReverse Osmosis
RORight Outboard
RORenewables Obligation (UK)
RORanking Officer
RORequest Order
RORetired Officer (UK)
ROResidence Order
RORide-On (Montgomery County, Maryland transit provider)
RORadiation Oncologist
RORock Opera
ROReceptor Occupancy (pharmacology)
RORegistration Officer
ROResearch Only
RORemains Open
RORadar Operator
RORecord Only
ROReliability of Operations
RORough Opening (construction)
RORemoval of (medical)
RORaphe Obscurus
RORevenue Officer
RORagnarok Online (computer game)
RORisk Officer
ROResident Office
ROReverse Order
RORestriction Orifice (device used to drop pressure in a pipe)
RORed Orchestra (computer game)
RORollover (financial)
ROResponsible Officer
RORevenue Outturn (UK)
RORight On
RORegnum Online (video game)