| Term | Full Form | Category |
|---|---|---|
| OPPN | Office of Permit and Project Navigation | Others |
| OPPN | Older Peoples Partnership Network | Others |
| OPPN | Open Peer to Peer Network | Others |
| OPPN | Operation Technical Policy and Procedure Notices (NYC) | Others |
| OPPN | Operations Policy and Procedure Notice | Others |
| OPPN | Outdoor Peer-to-Peer Networks | Others |