ONO
| Acronym | Definition |
|---|---|
| ONO | Or Nearest Offer |
| ONO | One Night Only (event) |
| ONO | Or Near Offer(s) |
| ONO | Oxide/Nitride/Oxide |
| ONO | Organization of News Ombudsmen |
| ONO | Oeste-Noroeste (Spanish: West-Northwest) |
| ONO | Open to New Opportunity |
| ONO | Ostnordost (German; East-North-East) |
| ONO | Over N Out (gaming clan) |
| ONO | Ontgiften, Neutraliseren en Ontwateren (Dutch: decontamination, neutralization, dehydration) |
| ONO | Ovest-Nord-Ovest (Italian: West-North-West) |
| ONO | Original Network Operator (mobile communications operator) |