| | P2P | | parent to parent |
| | P2P | | pay toplay |
| | P2P | | peer to peer |
| | P2P | | person to person |
| | P2P | | person-to-person |
| | P2P | | programmer to programmer |
| | P3P | | Platform for Privacy Preferences Project |
| | P4P | | Pay for Performance |
| | P4P | | Pay for Placement |
| | P4P | | Pay For Play |
| | P4P | | Pay For Pleasure |
| | pa | | parent alert |
| | pa | | per |
| | pa | | per annum |
| | pa | | personal assistant |
| | pa | | pf |
| | pa | | prosecuting attorney |
| | pa | | public anouncement |
| | pabg | | Pack A Big Gun |
| | PABX | | Private Automatic Branch Exchange |
| | pacs | | packs |
| | pacs | | Picture Archival Computer Systems |
| | pacs | | Picture Archiving and Communication Systems |
| | PAFO | | Pissed And Fell Over |
| | PAN | | people alleged to be normal |
| | PAN | | Personal area networking |
| | pans | | Pretty Amazing New Stuff |
| | pans | | Pretty Awesome New Stuff |
| | PARC | | Palo Alto Research Center |
| | PARC | | park |
|