| Term | Full Form | Definition | Meaning | Main Category | Subcategory | Country/ Region | Popularity |
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| ONU | Organizacion de Narcotraficantes Unidos | Associations & Organizations › Extremist Groups |  |
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| ONU | Ono I Lau Airport | Transport & Travel › Airport Codes |  |
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| ONVIF | Open Network Video Interface Forum | Associations & Organizations › Technological Organizations |  |
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| OODBMS | Object-Oriented DataBase Management System | Computing › Databases | |
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| OOO | Out of Order | Business › Business Terms | |
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| OOo | OpenOffice.org | Computing › Software & Applications | |
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| OOO | Out of Office | Business › Business Management | |
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| Ooo | Alturas Municipal Airport | Transport & Travel › Airport Codes |  |
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| OOP | Object-Oriented Programming | Computing › Programming & Development | |
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| OOPS | Out Of Phase Stereo | Technology › Tech Terms | |
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| OOPS | Out of Paper Sensor | Computing › Hardware | |
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| OOTD | Outfit Of The Day | Miscellaneous › Hashtags | |
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| OOTD | Offer of the Day | Business › Marketing | |
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| OOTN | Outfit Of The Night | Miscellaneous › Hashtags | |
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| OOTW | Operations Other Than War | Governmental › Military | |
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| OOTW | Outfit(s) Of The Week | Miscellaneous › Hashtags | |
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| OP | Original Post/Poster | Computing › Internet | |
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| OP | One Piece | Media & Entertainment › Manga & Anime | |
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| OP | Ocean Pacific | Business › Companies & Corporations | |
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| OP | OutPatient | Medical › Hospitals | |
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| OP | Optimus Prime | Miscellaneous › Fictional | |
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| Op | Opus number | Arts › Music | |
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| OP | Ordo Praedicatorum | Society & Culture › Religion & Spirituality | |
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| OP | OverPowered | Computing › Games & Entertainment | |
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| OP | Observation Post | Governmental › Military | |
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