| ODA | Open/Office Document Architecture |
| ODIF | Open/Office Document Interchange Format |
| OSITOP | Open Systems Interconnection Technical and Office Protocols |
| SOHO | Small Office, Home Office |
| ROBO | Remote Office Branch Office |
| WO | War Office |
| CO | Central Office |
| HO | Home Office |
| HO | Head Office |
| HBO | Home Box Office New York City, [NY], http://www.hbo.com |
| OM | Office Management |
| POB | Post Office Box |
| Ofcom | Office of Communications London, http://www.ofcom.org.uk |
| EO | End Office [Telekommunikation] |
| FO | Foreign Office |
| ORB | Office Repeater Bay |
| obt | Office 95 Sammelmappe v eine Dateiendung |
| obz | Office 95 Sammelmappe a eine Dateiendung |
| DTO | Direct To Office |
| OEO | Office of Economic Opportunity |
| PMO | Prime Minister's Office |
| NCO | National Coordination Office |
| NRO | National Reconnaissance Office |
| GAO | Government Accounting Office |
| GAO | General Accounting Office |
| OExP | Office of Exploration [NASA] |
| FXO | Foreign Exchange Office |
| obd | Office 95 Sammelmappen Datei eine Dateiendung |
| STO | Strategic Technology Office |
| ofn | Win95 Office Dokumente eine Dateiendung |
| pps | Office 95 Powerpoint Layouts eine Dateiendung |
| pot | Office 95 Powerpoint Präsentationsvorlage eine Dateiendung |
| GPO | General Post Office |
| GPO | Government Printing Office |
| SCO | Serving Central Office |
| TTO | Tactical Technology Office |
| LPO | Logical Post Office |
| RPO | Railway Post Office |
| TPO | Traveling Post Office |
| pwz | Office 95 Powerpoint Assistent eine Dateiendung |
| IPO | International Procurement Office |
| OEL | Office of Experiential Learning |
| IOT | Inter-Office Trunk |
| TOP | Technical and Office Protocol |
| IOM | International Office of Migration |
| IAO | Information Awareness Office Washington, DC, http://www.darpa.mil |
| OEL | Office of Export Licensing |
| MOW | Microsoft Office for Windows |
| RRO | Reports Receiving Office |
| PTO | Patent and Trademark Office Washington, DC, http://www.uspto.gov |