ONW
| Acronym | Definition |
|---|---|
| ONW | Olathe Northwest (school; Olathe, KS) |
| ONW | Operation Northern Watch |
| ONW | On Watch |
| ONW | omit needless words (Strunk and White) |
| ONW | omit needless words |
| ONW | Old Norwegian (linguistics) |
| ONW | Overshoot Noise Width |
| ONW | Orthopedics Northwest (Washington) |