Output Control Pulses (AD)
Overland Common Points (AD)
Carleton Place Public Library, Ontario - Library symbol - National Library of Canada (NLC)
Obstacle - or Obstruction Clearance Panel - Aviation (OA)
Occupational Cluster Program (OICC)
Ocean Culture Product
Ocean Surveillance Product (SAUS)
Octacalcium Phosphate - Inorganic chemistry
Ocular Cicatricial Pemphigoid - Ophthalmology
Oerlikon-Contraves Pyrotec AG (SAUS)
Office Cherifien des Phosphates - Office of the Sherifs of Phosphates
Office of Civilian Personnel - Military
Office of Commercial Programs - NASA
Office of Consumer Protection (AD)
Office of Cultural Presentations (AD)
Office of the Chief of Protocol - US Department of State (AD)
Officer Candidate Programme - British military (DMA)
Official Crude Prices - Petroleum Intelligence Weekly - Information service or system (CRD)
Oficina Central de Personal - Central Personnel Office - Spain (AD)
Olefin Co-Polymer - Lubricants
Omni Computer Productions
Omni Consumer Products (XSAL)
Onchocerciasis Chemotherapy Project - WHO
Onchocerciasis Control Program - World Health Organization (BUAC)
One-Component Plasma
Ontario College of Pharmacy
Open Circuit Potential (PDAA)
Open Closed Principle (XSAL)
Open Collections Program - Harvard University library program
Operating - or Operational Control Procedure (MSA)
Operational Capability Plan - Army
Operational Checkout Procedure - NASA (KSC)
Operational Communications Plan (MCD)
Operational Computer Program (ACAE)
Operational Configuration Processing (COE)
Operational Control Panel
Operation Control Panel (SAUS)
Operations Control Plan (AAG)
Operator Command Processor (TIMI)
Operators Control Panel (SAUS)
Optical Character Printing
Oracle Certified Professional (XSAL)
Oral Contraceptive Pill - Gynecology - Pharmacology (DAVI)
Orbital Combustion Process (PDAA)
Orbital Control Program (SAA)
Orbital Correction Program - NASA (KSC)
Order Code Processor - International Computers Ltd.
Organic Conducing Polymer (ODA)
Organizational Competitiveness Program - Motivational program
Organization of Czech Palynologists (SAUS)
Orientalia Christiana Periodica - A publication (ODCC)
Ortho-Chlorophenol - Organic chemistry
Ostacalcium Phosphate - A fertilizer
Out of Commission for Parts (AFM)
Output Control Program
Output Control Pulse (NASA)
Ova, Cysts, Parasites - Gastroenterology (DAVI)
Overcharge Protection (ACAE)
Overhead Control Panel - Automotive engineering
Overland Common Point - Imported item - Business term
Overload Control Process - Telecommunications (TEL)
Overseas Common Point - Exported item - Business term
Overseas Communications Project (SAUS)
Owners and Contractors Protective - Insurance
Oxford Concordance Project (NITA)
Paradise Boats, Ocean City, MD - Manufacturer code for watercraft hull identification number (USCG)
Public Library of Cincinnati and Hamilton County, Cincinnati, OH - OCLC symbol (OCLC)