| PNO | Pacific Northwest Orienteering 
| Others |
| PNO | Pagan's Night Out
| Others |
| PNO | Pair Natural Orbital
| Others |
| PNO | Parent Network Organization
| Others |
| PNO | Parent Networking Organization
| Others |
| PNO | Parents Night Out
| Others |
| PNO | Partit Nacionalista Occitan
| Others |
| PNO | Paumanok Night Out
| Others |
| PNO | Payment Network Operators
| Others |
| PNO | Pecunia No Olet
| Others |
| PNO | Pecunia non olet
| Others |
| PNO | Pelican New Orleans
| Others |
| PNO | People and Organization
| Others |
| PNO | Performers Network Online
| Others |
| PNO | Peri- Natal Quality register
| Others |
| PNO | Personal Non Owned
| Others |
| PNO | Personal Notes On
| Others |
| PNO | Pinotepa, Mexico
| Others |
| PNO | Planned Non Operation
| Others |
| PNO | Planned Non Operational
| Others |
| PNO | Plant Network Optimisation
| Others |
| PNO | Poets Night Out
| Others |
| PNO | Preferred Network Offload
| Others |
| PNO | Premerger Notification Office
| Others |
| PNO | Proactive Network Operations
| Others |
| PNO | PROFIBUS Nutzerorganisation, e. V.
| Others |
| PNO | Project Name Origins
| Others |
| PNO | Project New Outlook
| Others |
| PNO | Provider Network Operations
| Others |
| PNO | Public Network Operator
| Others |
| PNO | Public Network Operators
| Others |