OPN
OPN is the abbreviation for:
- Ordering Part Number for AMD processors
- OpenPHPNuke , a content management system
- Oracle PartnerNetwork , the association of Oracle partner companies
- OPN Certified Specialist , an IT certificate from the company
- Open Projects Network , a former name of Freenode
- Osteopontin , a protein
Often also in the form OPN is abbreviated
- Ora Pro Nobis (English: Pray for us ), a common inscription on images of saints and similar forms of veneration of saints
