| O&C | Official and Confidential 
| Others |
| O&C | Oldham and Crowther
| Others |
| O&C | Operation and Checkout
| Others |
| O&C | Operations and Control
| Others |
| O/C | Observer/Collector
| Others |
| O/C | Observer/Controller
| Others |
| O/C | Operations Critical
| Others |
| OC | Immediate Office of the Commissioner
| Others |
| OC | O Canada
| Others |
| OC | Oatmeal Cookie
| Others |
| OC | Obedience Champion
| Others |
| OC | Oberlin College
| Others |
| OC | Object Container
| Others |
| OC | Observatoire Cuirass
| Others |
| OC | Observer Controller
| Others |
| OC | Obsessive Compulsive
| Others |
| OC | Obstruction Chart
| Others |
| oc | Occitan
| Others |
| OC | Occupation Certificate
| Others |
| OC | Ocean City
| Others |
| OC | Ocean County
| Others |
| OC | Ocean Cove
| Others |
| OC | Oceans and Climate
| Others |
| OC | Octopus Card
| Others |
| OC | Odessa College
| Others |
| OC | Of Christ
| Others |
| OC | Off Camera
| Others |
| OC | Off Campus
| Others |
| OC | Off Center
| Others |
| OC | Offended Chicken
| Others |
| OC | Offensive Crouching
| Others |
| OC | Office Call
| Others |
| OC | Office of the Commissioner
| Others |
| OC | Officer in Command
| Others |
| OC | Officer's Cook
| Others |
| OC | Official Campaign
| Others |
| OC | Oh Crap
| Others |
| OC | Okeechobee County
| Others |
| OC | Oklahoma Christian
| Others |
| OC | Oklahoma City
| Others |
| OC | Old Chicago
| Others |
| OC | Old Clothes
| Others |
| OC | Old Coherence
| Others |
| OC | Old Colony
| Others |
| OC | Old Covenant
| Others |
| OC | Oleander City (nick-name of Galveston, Texas)
| Others |
| OC | Oleoresin Capsicum
| Others |
| OC | Oleoresin Capsicum (pepper spray for self-defense)
| Others |
| OC | Oliver Cromwell
| Others |
| OC | Olongapo City
| Others |
| OC | On Call
| Others |
| OC | On Center
| Others |
| OC | On Centre
| Others |
| OC | On Condition
| Others |
| OC | On-Condition
| Others |
| OC | Online Class
| Others |
| OC | Only Caucasians
| Others |
| OC | Open Canoe
| Others |
| OC | Open Canvas
| Others |
| OC | Open Carry
| Others |
| OC | Open Category
| Others |
| OC | Open Circuit
| Others |
| OC | Open Collector
| Others |
| OC | Open Concepts
| Others |
| OC | Open Corner
| Others |
| OC | Open Cup
| Others |
| OC | Open/Close
| Others |
| OC | Opening Ceremony
| Others |
| OC | Operating Characteristic
| Others |
| OC | Operation Christ
| Others |
| OC | Operation Classroom
| Others |
| OC | Operations Center
| Others |
| OC | Operations Controller
| Others |
| OC | Operations Coordinator
| Others |
| OC | Operator Cutoff
| Others |
| OC | Opportunity Cost
| Others |
| OC | Opposing Counsel
| Others |
| OC | Optical Cable
| Others |
| OC | Optical Carrier
| Others |
| OC | Optical Circuit
| Others |
| OC | Optical Circulator
| Others |
| OC | Optical Connection
| Others |
| OC | Optimal Classification
| Others |
| OC | Optimum Compaction
| Others |
| OC | Option Chain
| Others |
| OC | Oral Care
| Others |
| OC | Oral Coersion
| Others |
| OC | Oral Contraception
| Others |
| OC | Oral Contraceptive
| Others |
| OC | Orange Cat
| Others |
| OC | Orange Coast
| Others |
| OC | Orange County
| Others |
| OC | Orange County (California)
| Others |
| OC | Orange Crush
| Others |
| OC | Orbital Check
| Others |
| OC | Ordinary Chondrites
| Others |
| OC | Ordnance Corps
| Others |
| OC | Oregon City
| Others |
| OC | Orfevrerie Christofle
| Others |
| OC | Organi Collegiali
| Others |
| OC | Organic Carbon
| Others |
| OC | Organic Content
| Others |
| OC | Organisation Communication
| Others |
| OC | Organize and Collaborate
| Others |
| OC | Organized Clan
| Others |
| OC | Organized Crime
| Others |
| OC | Organizing Committee
| Others |
| OC | Origanal Character
| Others |
| OC | Original Character
| Others |
| OC | Original club
| Others |
| OC | Original Combo
| Others |
| OC | Original Content
| Others |
| OC | Original Cookies
| Others |
| OC | Original Creation
| Others |
| OC | Original Credit
| Others |
| OC | Original Cub
| Others |
| OC | Oringal Character
| Others |
| OC | Orospu Cocugu
| Others |
| OC | Orrible Children
| Others |
| OC | Osawatomie City, Kansas
| Others |
| OC | Ostrich Cookies
| Others |
| OC | Other Caste
| Others |
| OC | Other Category
| Others |
| OC | Other Character
| Others |
| OC | Other Characters
| Others |
| OC | Other Child
| Others |
| OC | Other Company
| Others |
| OC | Other Contingencies
| Others |
| OC | Other Contributors
| Others |
| OC | Ottawa Carleton
| Others |
| OC | our Acronym
| Others |
| OC | Our Crowd
| Others |
| OC | Out of Character
| Others |
| OC | Out of the Country
| Others |
| OC | Output Compare
| Others |
| OC | Output Coupler
| Others |
| OC | Outrageous Chaos
| Others |
| OC | Outrageously Cute
| Others |
| OC | Outrigger Canoe
| Others |
| OC | Outsourced Company
| Others |
| OC | Outta Control
| Others |
| OC | Over Clock
| Others |
| OC | Over Clocked
| Others |
| OC | Over Commercialized
| Others |
| OC | Over Committed
| Others |
| OC | Over Current
| Others |
| OC | Over-Clocked
| Others |
| OC | Overated Crap
| Others |
| OC | OverClock
| Others |
| OC | overclocking Of course
| Others |
| OC | OverCurrent
| Others |
| OC | Overgrown Children
| Others |
| OC | Overrated Claptrap
| Others |
| OC | Overtly Christian
| Others |
| OC | Owens Corning
| Others |
| OC | Own Character
| Others |
| OC | Own Child
| Others |
| OC | Own Creation
| Others |
| OC | Oxycontin
| Others |
| OC | The Order of Canada
| Others |