| Acronym | Definition |
|---|
| OON➣Only One Naked |
| OON➣Out of Nowhere |
| OON➣Object-Oriented Numerics (scientific computing) |
| OON➣Out of Network (health insurance) |
| OON➣Officer of the Order of the Niger (national honor; Nigeria) |
| OON➣Optimization of Optical Networks (workshop) |
| OON➣Ocean of Noise (Arcade Fire song) |
| OON➣Office of Neighborhoods (community resource) |