| A&O | Alpha & Omega [griech.] Erster und letzter Buchstabe des griechischen Alphabets [Anfang und Ende] |
| APO | Alpha Pi Omega [Sorority] [lat.] Erste Schwesternschaft amerikanischer Ureinwohnerinnen |
| CP | Computer Professional |
| Prof. Geogr. | Professional Geographer Zeitschrift |
| PCA | Professional Chess Association |
| PCO | Professional Congress Organizer |
| PDS | Professional Development System |
| PFS | Professional File System |
| PGA | Professional Golf Association |
| PGA | Professional Graphics Adapter |
| PGL | Professional Games League |
| PROFS | Professional Office System [IBM] |
| PRTI | Professional Realtime Interface |
| PSA | Professional Services Automation |
| PVS | Professional Vision Services |
| MPC | Microsoft Certified Professional |
| MCP | Microsoft Certified Professional |
| HPC | Health Professional Card |
| CLP | Certified Lotus Professional |
| CIP | Certified Internet Professional |
| U.S. Geol. Surv. Prof. Pap. | U.S. Geological Survey Professional Paper Zeitschrift |
| PSRO | Professional Standards Review Organisations |
| CCDP | Cisco Certified Design Professional |
| CCIP | Cisco Certified Internetwork Professional |
| BPOL | Business, Professional and Occupational Licenses [engl.] Frührere Bezeichnung des amerikanischen Programms für Steuererklärungen [heute TFOP] |
| BPW | Business and Professional Women's Foundation [engl.] Verband der Geschäftsfrauen |
| CCDP-WAN | Cisco Certified Design Professional WAN Switching |
| CCNA-WAN | Cisco Certified Network Professional WAN Switching |
| CCNP | Cisco Certified Network Professional [engl.] Firmenspezifische Berufszertifikation |
| CCNP-WAN | Cisco Certified Network Professional WAN Switching |
| IFBPW | International Federation of Business and Professional Women London |
| CEPIS | Council of European Professional Informatics Societies [engl.] Frankfurt/Main |