OCNO
| Acronym | Definition |
|---|---|
| OCNO | Office of the Chief of Naval Operations (US Navy) |
| OCNO | Oblastné Centrum Námestovo (Slovak: Námestovo Regional Center; Námestovo, Slovakia) |
| OCNO | Office of the Chief Nursing Officer (Department of Health; Western Australia; Australia) |
| OCNO | Olde Cotswold Neighborhood Organization (Charlotte, NC) |