ONH
| Acronym | Definition |
|---|---|
| ONH | Optic Nerve Hypoplasia |
| ONH | Optic Nerve Head (ophthalmology) |
| ONH | Ongkos Naik Haji (Indonesian: Hajj Fees Increases) |
| ONH | Office of Naval History (US Navy) |
| ONH | Osaka National Hospital (Osaka, Japan) |
| ONH | Old Naval Hospital |
| ONH | Opera New Hampshire |
| ONH | Operation New Hope, Inc. (est. 1999; Jacksonville, FL) |