| Acronym | Definition |
|---|
| ONR➣Office of Naval Research |
| ONR➣Office for Nuclear Regulation (UK) |
| ONR➣Ontario Northland Railway |
| ONR➣Oboz Narodowo Radykalny (Polish: National Radical Camp) |
| ONR➣Office of National Reconstruction (Jamaica) |
| ONR➣Organisation for National Reconstruction (political party; Trinidad and Tobago) |
| ONR➣Optimized News Release |