OP
- OP
- (i) Observation Point/Post
- Ocean Pacific (surfwear and swimwear brand)
- Original Poster (internet)
- Order Point, in inventory management; the inventory state at which more items should be ordered. Often expressed as a part of OP/OQ (when quantity OP is reached, order OQ new items)
- OPA – (i) Other Procurement, Army
- OPAC – (a) Online Public Access Catalogue
- op cit – (p) opera citata (Latin, "in the work cited")
- OPCON – (p) Operational control
- OPCW – (i) Organisation for the Prohibition of Chemical Weapons
- OPEC – (a) Organization of Petroleum Exporting Countries
- OPFOR – (p) Opposing force(s)
- OPI
- (i) Office of Primary Interest
- Open Prepress Interface
- OPINTEL – (p) Operational Intelligence
- OPLAN – (p) Operation plan (also OpPlan)
- OPORD – (p) Operation order
- OPP
- (i) Ontario Provincial Police
- Operational Planning Process
- Other People's Property/Pu**y/Penis (song)
- OPS
- (i) On-base plus slugging (baseball statistics)
- (p) Operations
- OPSEC
- (p) Operations security
- Open Platform for Security
- OPSI
- (a) Overwhelming post splenectomy infection
- UK Office of Public Sector Information
- OPTAR – (p) Operational target
- OPV – (i) Offshore Patrol Vessel
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