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- OP
- OP(C8H17)3
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- OP-50
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- OP1dB
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- OP9 cell
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- OPA
- OPA!
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- OPA1
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- OPA3
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- OPAC
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- OPACY
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- OPAL
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- OPALIN
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- OPALS
- OPALS (Ogren Plant Allergy Scale)
- OPALS® (Ogren Plant Allergy Scale)
- OPAL (CERN)
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- OPAL Soil Centre
- OPAL detector
- OPAL experiment
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- OPAL reactor
- OPAM
- OPAMP
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- OPANAL
- OPANA ER
- OPAP
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- OPAP Basket League
- OPAR
- OPAR L'Orientale Open Archive
- OPASTCO
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- OPAZ
- OPA (disambiguation)
- OPA (song)
- OPA 90
- OPA Alpen Cup Ski Jumping
- OPA Co., Ltd.
- OPA Co. Ltd
- OPA Co. Ltd.
- OPA anhydrase
- OPA co. ltd.
- OPA mixture
- OPB
- OPBF
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- OPBW
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- OPC
- OPC-14597
- OPC-34712
- OPCA
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- OPCMIA Cement Masons and Plasterers Local 528
- OPCML
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- OPCON
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- OPCS-4.6
- OPCS 4.4
- OPCUA
- OPCW
- OPCW-The Hague Award
- OPCW-UN Joint Investigative Mechanism
- OPCW-UN Joint Mission in Syria
- OPCW Fact-Finding Mission in Syria
- OPCW–The Hague Award
- OPCY
- OPC (disambiguation)
- OPC DA
- OPC Data Access
- OPC Foundation
- OPC HDA
- OPC Historical Data Access
- OPC Server
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- OPC Unified Architecture
- OPC Xi
- OPC foundation
- OPC server
- OPCl3
- OPD
- OPDA
- OPDAN
- OPDB
- OPDC
- OPDG
- OPDI
- OPDO
- OPDS
- OPDS (disambiguation)
- OPD (disambiguation)
- OPD Mini Processor
- OPD mini processor
- OPD miniprocessor
- OPE
- OPEB
- OPEC
- OPEC+
- OPECST
- OPEC Cartel
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- OPEC Secretary-General
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- OPEC siege
- OPEI
- OPEIU
- OPEL Networks
- OPEN
- OPEN100
- OPENCities
- OPENDOS
- OPENDOS.INI
- OPENMEDIA.CA
- OPENRoad
- OPENSTEP
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- OPENSTEP 5.0
- OPENSTEP Enterprise
- OPENSTEP character set
- OPENSTEP encoding
- OPENSTEP encoding vector
- OPENSUSE
- OPEN (Indian magazine)
- OPEN (North Dakota magazine)
- OPEN (magazine)
- OPEN Act
- OPEN Alliance
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- OPEN Alliance SIG
- OPEN CASCADE
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- OPEN Fest Sarajevo
- OPEN Government Act of 2007
- OPEN Government Data Act
- OPEN LOOK
- OPEN Magazine
- OPEN Magazine, India
- OPEN Norwich
- OPEN magazine
- OPEP
- OPERA
- OPERATION ATALANTA
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- OPERATION MINARET
- OPERATION SHAMROCK
- OPERATORchan
- OPERA America
- OPERA Detector
- OPERA Experiment
- OPERA JET
- OPERA experiment
- OPERA faster-than-light neutrino anomaly
- OPERA faster-than-light neutrinos
- OPERA neutrino anomaly
- OPET
- OPEVAL
- OPEW
- OPEX
- OPEX (Corporation)
- OPEX (Stock Exchange)
- OPEX (corporation)
- OPEX (disambiguation)
- OPEX Corporation
- OPE (disambiguation)
- OPF
- OPF-02
- OPF:DR
- OPFA
- OPFC
- OPFL
- OPFOR
- OPF (disambiguation)
- OPF (file format)
- OPF Boys College Islamabad
- OPF Schools
- OPG
- OPGA
- OPGAI
- OPGD
- OPGL
- OPGS
- OPGT
- OPGW
- OPG (disambiguation)
- OPG 7 commemorative turbine
- OPG v. Diebold
- OPH
- OPHEP
- OPHI
- OPHL
- OPHN1
- OPHN1 (gene)
- OPHR
- OPHS
- OPHS (disambiguation)
- OPH (disambiguation)
- OPI
- OPIATE Mu
- OPIC
- OPIC (disambiguation)
- OPIDN
- OPIDP
- OPIE
- OPIE (Entomology)
- OPIE (disambiguation)
- OPIE Authentication System
- OPIN
- OPINION IS UNPOPULAR
- OPIRG
- OPIS
- OPIS (disambiguation)
- OPI (disambiguation)
- OPI Products
- OPJ
- OPJA
- OPJAHL
- OPJHL
- OPJHL Standings
- OPJHL Standings (1972-1981)
- OPJI
- OPJM
- OPJRA
- OPJS University
- OPJU
- OPJ (disambiguation)
- OPK
- OPK-88004
- OPKC
- OPKD
- OPKH
- OPKO Health
- OPKO Health, Inc.
- OPKT
- OPK (disambiguation)
- OPK Oboronprom
- OPL
- OPL-3
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- OPL4
- OPLA
- OPLAN
- OPLAN 34A
- OPLAN 5027
- OPLAN 5027 scenarios
- OPLAN 5029
- OPLAN 5029 scenarios
- OPLAN 8010
- OPLAN 8010-12
- OPLAN 8044
- OPLAN Exodus
- OPLA (disambiguation)
- OPLH
- OPLIN
- OPLL
- OPLL (disambiguation)
- OPLS
- OPL (disambiguation)
- OPL Development Studio
- OPL and LAC Joint Facility
- OPL and LAC joint facility
- OPL programming language
- OPM
- OPM-FIS
- OPM-SANG
- OPM3
- OPMA
- OPMD
- OPMF
- OPMI
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- OPML
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- OPMT