| Ooo | Alturas Municipal Airport 
| Others |
| OOO | Internet Top-Level Domain Name for E-Commerce (not an acronym)
| Others |
| OOO | Object of Obsession
| Others |
| OOO | Object Oriented Ogonkify
| Others |
| OOO | Object Oriented Ontology
| Others |
| OOO | Obligatory Other Option
| Others |
| OOO | Obshestvo S Ogranichennoy Otvetstvennjctyu
| Others |
| OOO | Off On One
| Others |
| OOO | Office of Ombudsman
| Others |
| OOO | Office of Ombudsman OOO
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| OOO | Oil of Olay
| Others |
| OOO | Olympic O Olympics
| Others |
| OOO | Omnd Omnd Ohk
| Others |
| OOO | On Our Own
| Others |
| OOO | One on One
| Others |
| OOO | Onsite Offsite and Offshore
| Others |
| OOO | Onsite, Offsite, and Offshore
| Others |
| OOO | Open Office Org
| Others |
| OOO | Open Organic and Optima
| Others |
| OOo | OpenOffice.org
| Others |
| OOO | Oracle Open Office
| Others |
| OOO | Order Of Operatations
| Others |
| OOO | Order Of Owls
| Others |
| OOO | Order of the Overflow
| Others |
| OOO | Oscuro's Oblivion Overhaul
| Others |
| OOO | Oscuros Oblivion Overhaul
| Others |
| OOO | Our Original Opinion
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| OOO | Our Own Option
| Others |
| OOO | Out of Office
| Others |
| OOO | Out Of Options
| Others |
| OOO | Out of Order
| Others |
| OOO | Out Of Order Once
| Others |
| OOO | Out of Organisation
| Others |
| OOO | Outside of Ordinary
| Others |
| OOO | Outside Of the Object
| Others |
| OOO | Outstanding Ordinary Objects
| Others |
| OOO | Overly Officious Official
| Others |
| OOO | Ozonated Olive Oil
| Others |