| Acronym | Definition |
|---|
| PNO | Piano (music) |
| PNO | Provider Network Operations (medical care) |
| PNO | Principal Nursing Officer |
| PNO | Public Network Operators |
| PNO | Parent's Night Out |
| PNO | Pneumothorax (pulmonology) |
| PNO | Project Number (assigned by activity) |
| PNO | Public Network Operator |
| PNO | Program Number |
| PNO | Pecunia Non Olet (Latin: money does not smell) |
| PNO | Port of New Orleans |
| PNO | Pa-O National Organization (Myanmar) |
| PNO | Precipitation Amount Not Available (METAR code) |
| PNO | Premerger Notification Office (US FTC) |
| PNO | Pagan's Night Out (est. 1992) |
| PNO | Pair Natural Orbital |
| PNO | Petri Nets with Objects |
| PNO | Pseudo-Natural Orbital |
| PNO | Planned Nonoperation (vehicle status) |
| PNO | Plasma-Nitrided Oxide |
| PNO | Prenegotiation Objective (contracting) |
| PNO | Property Notarization Order (real estate) |