 | O'Brien Effect |
| Obeya |
| Object |
| Object Data Management Group (ODMG) |
| Object Description |
| Objective |
| Objective Evidence |
| Objectivity |
| Object Management Group (OMG) |
| Object Orientation (OO) |
| Object-Oriented Database Management System (ODBMS) |
| Object-Process Methodology (OPM) |
| Object Technology |
| Obliterator |
| Observation |
| Observation Domain Model |
| Observation Model |
| Occupant |
| Occupant (Resident) Lists |
| Occupant Address |
| Occupational surname |
| Occurrence |
| Occurrence of record |
| OCR Read Area |
| Offer |
| Officer in Charge (OIC) |
| Offices |
| Office Time |
| Official Mail |
| Official Mail Accounting System (OMAS) |
| Official Personnel Folder (OPF) |
| Offshore Outsourcing |
| Offshoring |
| OGC Interoperability Program |
| OLAP Browser |
| OLAP Client |
| OLAP Services |
| OLAP System |
| OnDemand |
| On-demand Interpretation (ODI) |
| One Piece Flow |
| One-Shot Mailing |
| One-Time Buyer |
| One-Time Password |
| One-Time Password Specifications (OTPS) |
| One-Time Use |
| One-to-many Relationship |
| One-to-One Marketing |
| One-to-one Relationship |
| One-Up Labels |
| One-Year Contract |
| Ongoing Process Capability |
| Online |
| On-Line Analytical Processing (OLAP) |
| On-line Availability |
| On-Line File Maintenance (OFM) |
| Online Machine Translation |
| On-Line Query |
| On-line Transaction Processing (OLTP) |
| On-site Interpretation |
| On-Site Meter Setting |
| On-the-Clock / Off-the-Clock |
| Ontology |
| Open Architecture |
| Open Database Connectivity (ODBC) |
| OpenGIS |
| OpenGIS Abstract Specification |
| OpenGIS Implementation Specification |
| OpenGIS Reference Model (ORM) |
| OpenGIS Specification |
| Opening Unit |
| Open Interface |
| Open Lexicon Interchange Format (OLIF) |
| Open Location Services |
| Open Mobile Alliance (OMA) |
| Open Platform |
| Open Rate |
| Open Source |
| Open-Source Software |
| Open Specification |
| Open Standard |
| Open System |
| Open System Environment |
| Open Transit |
| Operating Characteristic Curve (OC Curve) |
| Operating System |
| Operation |
| Operational Consolidation |
| Operational Cost |
| Operational Data |
| Operational Database |
| Operational Data Source |
| Operational Data Store / Datastore (ODS) |
| Operational Definition |
| Operational information steward |
| Operational Metadata |
| Operational Performance |
| Operational Processing |
| Operational Systems |
| Operation Cost Target (OCT) |
| Opinion |
| Opportunity |
| Opportunity Creation |
| Opportunity Seeker |
| Optical Character Reader (OCR) |
| Optical character recognition (OCR) |
| Optimization |
| Optimize |
| Optimized Data |
| Optimum |
| Opt-in |
| Optional Endorsement Line (OEL) |
| Optional Procedure Mailing System (OP) |
| Opt-out |
| Or Current Resident |
| Order |
| Order Entry Procedure |
| Order Form |
| Order Margin |
| Ordinal Data |
| Ordinal Data Type |
| Ordinary |
| Ordinary Mail |
| Organic Search Listings |
| Organization |
| Organization's Environment |
| Organizational Change Management |
| Organizational Culture |
| Organizational Intelligence |
| Organization for the Advancement of Structured Information (OASIS) |
| Organization Structure |
| Original Entry |
| Original Equipment Manufacturer (OEM) |
| Original Mailing Office |
| Originating Mail |
| Origination |
| Origin Bulk Mail Center (OBMC) Presort Rate |
| Origin Destination Information System (ODIS) |
| Origin Facility |
| Orthophoto Map |
| Orthorectification |
| Other Articles (AO) |
| Outer Join |
| Outgoing Calls |
| Outgoing Mail |
| Outlier |
| Out-of-Control Process |
| Out of Spec |
| Output |
| Outputs |
| Outsert |
| Outside |
| Outside Parcel |
| Outsource |
| Outsourced Process |
| Outsourcing |
| Overage |
| Overall Equipment Effectiveness (OCT) |
| Over-Carry |
| Overflow Tray |
| Overlay |
| Overlays |
| Overloaded data element |
| Overnighter, The |
| Oversized Rate |
| Over-the-Phone Interpretation |
| Over-the-Road Container (OTR) |
| Owners |
| Owner Service Bureau |
| Ownership |
| OWS Service Framework |
