Full forms starting with “O”

AcronymFull Form
OOxygen
OOh
ooctet
OOberst
OPyrrolysine
O/oOffice of
O2Oxygen
O2OOnline to Offline
O3bOther 3 billion
OABOman Arab Bank
OASOracle Application Server
OASOption Adjusted Spread
OASOffice of Applied Studies
OASOrganization of American States
OAuthOpen Authorization
OBCOriental Bank of Commerce
OBCOrganic & Biomolecular Chemistry
OBCOrquestra Simfònica de Barcelona i Nacional de Catalunya
OBCOther Backward Class
OBCOrder of British Columbia
OBCOsaka Broadcasting Corporation
OBCOsservatorio Balcani e Caucaso
OBCOntario Building Code
OBCOver Betuwe College
OBDOn-Board Diagnostics
OBDOutbound Dialler
OBDOpposed Blade Damper
OBDObano Airport
OBDOrganic Brain Disease
OCOriginal Content
OCOrange County
OCOpen Circuit
OCOverClocking/OverClock
OCOriginal Character
OCOcean City
ocOccitan
OCOrganic Carbon
OCOptical Carrier
OCOral Contraceptive
OCOberlin College
OCOpen Collector
OCOctopus Card
OCOleoresin Capsicum
OCBCOversea-Chinese Banking Corporation
OCBCOrange County Business Council
OCBCOrange County Buddhist Church
OCBCOld Cambridge Baptist Church
OCBCOakland Cannabis Buyers’ Cooperative
OCBCOrange County Badminton Club
OCDObsessive Compulsive Disorder
OCDOsteochondritis Dissecans
OCDOffice of Civilian Defense
OCIOther Comprehensive Income
OCIOracle Cloud Infrastructure
OCIOracle Call Interface
OCIOverseas Citizenship of India
OCIOrascom Construction Industries
OCIOrganisation de la Coopération Islamique
OCIOn-Campus Interview
OCIOffice of Criminal Investigations
OCIOpen Catalog Interface
OCIOpen Container Initiative
ociOccitan
OCIOrganizational Conflict of Interest
OCIOlympic Council of Ireland
OCIOntario Cancer Institute
OCIOrganisation Communiste Internationaliste
OCIOakwood Collegiate Institute
OCIOpen Constitution Initiative
OCPOracle Certified Professional
OCROptical Character Recognition
OCROffice for Civil Rights
OCROffice for Civil Rights
OCROxford, Cambridge and RSA Examinations
OCROfficial Cash Rate
OCROfficial Cash Rate
OCROptimal Currency Region
OCROld Cask Rum
OctOctober
OCTOffice of Cable Television
OctOctal
OCTOptical Coherence Tomography
OCTOxford Classical Texts
OCTOntario College of Teachers
OCTOxytocin Challenge Test
OCTOptimal Control Theory
OCVOpen Circuit Voltage
ODDoctor of Optometry
ODOverdraft
ODMalindo Air
ODOptical Density
ODOrganization Development
ODOccupational Disease
ODOutside Diameter
ODOverdose
ODOpportunistic Disease
ODOxygen Demand
ODAOfficial Development Assistance
ODAOpen Document Architecture
ODAOregon Department of Agriculture
ODAOlympic Delivery Authority
ODAOhio Dental Association
ODAOuadda Airport
ODBCOpen Data Base Connectivity
ODFLOld Dominion Freight Line
ODFLOpen, Distance and Flexible Learning
ODFLOne Dollar For Life
ODFLOmeo and District Football League
ODIOne Day International
ODIOverseas Development Institute
ODPOpen Directory Project
ODPOcean Drilling Program
OEOutlook Express
OECDOrganisation for Economic Co-operation and Development
OECDOffice for Early Childhood Development
OEDOxford English Dictionary
OEDOregon Employment Department
OEMOriginal Equipment Manufacturer
OEMOffice of Emergency Management
OEMOracle Enterprise Manager
OEMObject Exchange Model
OEMVincent Fayks Airport
OFBOutput FeedBack
OFBOrdnance Factories Board
OFBOpen for Business
OFCOptical Fiber Communication
OFCOrbitofrontal Cortex
OFCOxygen Free Copper
OFCOptical Fiber Cable
ofcof course
OFCOceania Football Confederation
OFCCorporate Office Properties Trust
OFCOffshore Financial Centre
OFCOpen Face Chinese
OFCOxyfuel Gas Cutting
OFCOptional Federal Charter
OFCOxford Farming Conference
OFCOpen Fiber Control
OFCOpen Financial Connectivity
OFCOriginal Fine Canadian
OFCOttawa Folklore Centre
OFCOptical Fiber Conductive
OfgemOffice of Gas and Electricity Markets
OfgemOffice of Gas and Electricity Markets
OggOgg derives from ogging, jargon from the computer game Netrek
OGGKahului Airport
OGPAOverall Grade Point Average
OHCHROffice of the United Nations High Commissioner for Human Rights
Ohmnamed after German physicist, Georg Simon Ohm
OHPOverHead Projector
OHPOregon Health Plan
OHPObservatoire de Haute-Provence
OHPOccupational Health Psychology
OHPOklahoma Highway Patrol
OHPOpen House Party
OHPOpen Humanities Press
OHPOrder of The Holy Paraclete
OHVOff Highway Vehicle
OHVOverHead Valve
OIDAROnline Information and Database Access or Retrieval
OIGSOsaka International Gift Show
OIGSOutreach Institute of Gender Studies
OILOil India Limited
OILOperation Iraqi Liberation
OILOntology Inference Layer
OKOll Korrect
OKOklahoma
OKOld Kinderhook
OKCzech Airlines
OLEDOrganic Light-Emitting Diode
OLEDBObject Linking and Embedding, Database
OLXOn Line eXchange
OMAPOpen Multimedia Application Platform
OMCOrganización Mundial del Comercio
OMCOrganisation Mondiale du Commerce
OMCOrganização Mundial do Comércio
OMCOmnicom Group Inc.
OMCOpen Method of Coordination
OMCOdisha Mining Corporation
OMCOil Marketing Company
OMCOrmoc Airport
OMCOperation and Maintenance Center
OMCOctyl-methoxycinnamate
OMCOrdem do Mérito Cultural
OMCOutboard Marine Corporation
OMCOlifant Manufacturing Company
OMCOxford Mindfulness Centre
OMCOsaka Medical College
OMCOtara Millionaires Club
OMCOntario Medal for Good Citizenship
OMFEDOrissa State Cooperative Milk Producers’ Federation Limited
OMGOh My God
OMGObject Management Group
OMGOcular Myasthenia Gravis
OMROmani Rial
OMROld Mahabalipuram Road
OMROptical Mark Recognition
OMROptical Mark Reader
OMROradea Airport
OMROptical Music Recognition
OMROutermost Regions
OMROntario Medical Review
OMSOrganisation Mondiale de la Santé
OMSOrder Management System
OMWOn My Way
OMWOgden Murphy Wallace
ONGCOil and Natural Gas Corporation
Onkyotranslates as “sound harmony”
ONVIFOpen Network Video Interface Forum
OODBMSObject-Oriented Data Base Management System
OOOOut of Order
OOoOpenOffice.org
OOOOut of Office
OooAlturas Municipal Airport
OOPObject-Oriented Programming
OOPSOut Of Phase Stereo
OOPSOut of Paper Sensor
OOTDOutfit Of The Day
OOTDOffer of the Day
OOTNOutfit Of The Night
OOTWOperations Other Than War
OOTWOutfit(s) Of The Week
OPOriginal Post/Poster
OPOne Piece
OPOcean Pacific
OPOutPatient
OPOptimus Prime
OpOpus number
OPOrdo Praedicatorum
OPOverPowered
OPObservation Post
OPOrganoPhosphate
OPOut of Print
OPOriginal Pronunciation
OPOperational Planning
OPOsuusPankki
OPOrange Pekoe
OPOverall Position
OPOverland Park
OPOpposite Prompt
OpOrder in probability
OPOratory Prep
opoborový podnik
OPACOnline Public Access Catalog
OPACOffice Proficiency Assessment and Certification
OPCOLE for Process Control
OPCOne Person Company
OPCOptical Proximity Correction
OPCOptimum Power Calibration
OPCOrthodox Presbyterian Church
OPCOffice of the Parliamentary Counsel
OPCOrganic Photo-Conductor
OPCOpel Performance Center
OPCOntario Police College
OPCOtsuka Pharmaceutical Company
OPCOligomeric Proanthocyanidins
OPCOodua Peoples Congress
OPCOvamboland People’s Congress
OPDOakland Police Department
OPDOutpatient Department
OPDOrlando Police Department
OPECOrganization of Petroleum Exporting Countries
OPECOhio Prevention and Education Conference
OPeNDAPOpen-source Project for a Network Data Access Protocol
OPGWOptical Ground Wire
OPORDOperation(s) Order
OppOpposite
OPPOntario Provincial Police
OPPObject Push Profile
OPPOver Power Protection
OPPOvine Progressive Pneumonia
OPPOffice of Pesticide Programs
OPPOrangi Pilot Project
OPPOrtho-Phenylphenol
OPPOffice of Polar Programs
OPPOffice of Public Prosecutions
OPPOffentligt-Privat Partnerskab
OPPOffice of Physical Plant
OPPOrleans Parish Prison
OPPOpen Prosthetics Project
OPROperator/Operate/Operation
OPROffice of Population Research
OPROffice of Professional Responsibility
OPROverall Pressure Ratio
OPROvernight Policy Rate
OPROrganisation du Peuple Rodriguais
OPROld Parochial Registers
OPROld Port Rum
OPSOffice of Public Safety
OPSOmaha Public Schools
OPSOracle Parallel Server
OPSOttakara Panneerselvam
OPSOptical Parking System
OPSOttawa Police Service
OPSOn-Base Plus Slugging
OPSMOptical Prescription Spectacle Makers
OPSMOracle Parallel Server Management
OROregon
orOriya
OROdds Ratio
ORArkeFly
Oraclethe name Oracle comes from the code name of a CIA project
Oral-BOral-Brush
OrCADOregon + CAD
orgOrganization
ORGOxford Research Group
ORGOpen Rights Group
ORGZorg en Hoop Airport
Orkutnamed after its creator, Orkut Büyükkökten
ORMObject-Relational Mapping
ORMOperational Risk Management
ORMOnline Reputation Management
ORMObject-Role Modeling
ORMSywell Aerodrome Airport
ormOromo
ORMOrion Metals Limited
ORMObservatorio del Roque de los Muchachos
ORMOrosomucoid
ORSOral Rehydration Solution
ORSOlfactory Reference Syndrome
ORSOrthopaedic Research Society
ORSOld Red Sandstone
ORSOregon Revised Statutes
ORSOverseas Research Scholarship
ORSOxygen Reduction System
ORSOculo-Respiratory Syndrome
ORSOID Resolution System
ORSOrcas Island Airport
ORVMOutside Rear View Mirror
OSOperating System
OSOpen Source
OSCEOrganization for Security and Co-operation in Europe
OSCEObjective Structured Clinical Examination
OSCONO’Reilly Open Source Convention
OSDOn-Screen Display
OSHAOccupational Safety and Health Administration
OSHAOccupational Safety and Health Association
OSHAOregon Speech-Language-Hearing Association
OSIOpen Systems Interconnection
OsramOsmium + Wolfram
OSRTCOdisha State Road Transport Corporation
OSSOpen Source Software
OSSOpen Sound System
OSSOffice of Strategic Services
OSVOur Sunday Visitor
OSVOriginal Seen & Verified
OSVOffshore Supply Vessel
OSVOld Sturbridge Village
OTOccupational Therapist
OTOccupational Therapy
OTOperation Theatre
OTOperational Technology
OTOff-Topic
OTOxytocin
OTOverTime
OTOperación Triunfo
OTObrněný Transportér
OTOld Testament
OTOptimality Theory
OTOverTime
OTOperation Transformation
OTOrganisation Todt
OTOyu Tolgoi
OTOperating Thetan
OTOblivious Transfer
OTOperational Transformation
OTOffensive Tackle
OTAeropelican Air Services
OTAOver-the-air
OTAOffice of Technology Assessment
OTAOrganic Trade Association
OTAOrthodontic Technicians Association
OTAOperational Transconductance Amplifier
OTCOver The Counter
OTCOpenText Corporation
OTCOver The Counter
OTCOsaka Titanium Technologies
OTCOzarks Technical Community College
OTCOrnithine Transcarbamylase
OTCEIOver the Counter Exchange of India
OTEOn-Target Earnings
OTEΟργανισμός Τηλεπικοινωνιών Ελλάδος
OTEOxygen Transfer Efficiency
OTEOptically Transparent Electrode
OTETOvarian-Type Epithelial Tumors
OTETOrissa Teachers Eligibility Test
OTGOn-The-Go
OTGOver The Glasses
OTGOven Toaster Griller
OTGOff-The-Grid
OTGWorthington Airport
OTGOctyl Thioglucoside
OTGOne Two Go Airlines
OTMOne Time Mandate
OTMOttumwa
OTMOSHA Technical Manual
OTMOpen Tip Match
OTMOttumwa Regional Airport
OTMOf The Month
OTMOffice of Technology Management
OTMOn the Media
OTMOperations and Technology Management
OTMOn the Move
OTPOne Time Password
OTPOne Time Programmable
OTPOpposite Track Path
OTPBucharest Otopeni International Airport
OTPOut of Turn Priority
OTTOver-The-Top
OTTOttawa
OTTOpenDocument Text Template
OTTOverseas Trained Teacher
OTTOne-Time Tape
OUOpen Universities
OUOpen University
OUUniversity of Oklahoma
OUOhio University
OUOsmania University
OUPOxford University Press
OUPOrnstein–Uhlenbeck Process
OVRMOverdimension Vehicle Route Maps
OVRMOkanagan Vacation Rental Management
OWASPOpen Web Application Security Project
OxfamOxford Committee for Famine Relief
OyOsakeyhtiö
OYECOwn Your Electric Connection
OyjJulkinen Osakeyhtiö
OYOOn Your Own
OYOOmbetja Yehinga Organisation
ozOunce
OZAsiana Airlines Inc.
OZOlimpia Zagnoli
Ozonenamed after the Greek verb Ozein (to smell), from the peculiar odor in lightning storms
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