| O&O | Offshoring And Outsourcing 
| Others |
| O&O | Operational and Organizational
| Others |
| O&O | Organizations and Operations
| Others |
| O&O | Over and Out
| Others |
| O&O | Owned & Operated
| Others |
| O&O | Owned and Operated
| Others |
| O+O | Offline Plus Online
| Others |
| O+O | Offline plus Online / O plus O
| Others |
| O+O | Online and Offline
| Others |
| O.o | Confusion
| Others |
| O.O | Surprised. Confused. Shocked.
| Others |
| O/o | Office of
| Others |
| O/O | On Orbit
| Others |
| OO | A Outstanding Options
| Others |
| OO | Oakwood Outlaws
| Others |
| OO | Obiettivi Operativi
| Others |
| OO | Object Object
| Others |
| OO | Object Orientation
| Others |
| OO | Object-Oriented
| Others |
| OO | Objektorientierung
| Others |
| OO | Ochrana Ovzdusi
| Others |
| OO | Octopus Overlords
| Others |
| OO | Office of Origin
| Others |
| OO | Official Observer
| Others |
| OO | Ohh Ohh
| Others |
| OO | Olive Oil
| Others |
| OO | Olivia O
| Others |
| OO | On Order
| Others |
| OO | One One
| Others |
| OO | Oonajor One
| Others |
| OO | Open Office
| Others |
| OO | Open Optionals
| Others |
| OO | OpenOffice
| Others |
| OO | Openoffice Oo
| Others |
| OO | Operations Orchestration
| Others |
| OO | Ophthalmic Optician
| Others |
| OO | Optimum Organic
| Others |
| OO | Optix Obsessive
| Others |
| OO | Orange Oatmeal
| Others |
| OO | Orbital Order
| Others |
| OO | Orbitally Ordered
| Others |
| OO | Order Online
| Others |
| OO | Original Oratory
| Others |
| OO | Other Orthogonal
| Others |
| OO | Outer Office
| Others |