| Acronym | Meaning |
 | PDF | Portable Document Format |
| PDL | Page Description Language |
| PE | Portable Executable |
| PERL | Practical Extraction And Report Language |
| PFR | Portable Font Resource |
| PGA | Pad Grid Array |
| PGA | Pin Grid Array |
| PGA | Professional Graphic Adapter |
| PGM | Pragmatic General Multicast / Pretty Good Multicast |
| PGP | Pretty Good Privacy |
| PHB | Photochemical Hole Burning |
| PHP | PHP Hypertext Preprocessor (Personal Home Page) |
| PIC | Programmable Interrupt Controller |
| PICNIC | Problem In Chair, Not In Computer |
| PIF | Program Information File |
| PIM | Personal Information Manager |
| PIN | Personal Identification Number |
| PING | Packet Internet Groper |
| PIO | Programmed Input Output |
| PIP | Peripheral Interchange Program |
| PISO | Parallel-In/Serial-Out |
| PITA | Pain In The Ass / Arse |
| PJTF | Portable Job Ticket Format |
| PKI | Public Key Infrastructure |
| PLA | Programmable Logic Array |
| PLD | Programmable Logic Device |
| PMML | Predictive Modeling Markup Language |
| PMS | Pantone Matching System |
| PMT | Photomultiplier Tube |
| PNG | Portable Network Graphics; Image Format |
| PNP | Plug And Play |
| POP | Post Office Protocol |
| POS | Pivoting Optical Servo |
| POSIX | Portable Operating System Interface For UNIX |
| POST | Power On Self Test |
| POTS | Plain Old Telephone Service |
| PPCP | PowerPC Platform |
| PPM | Pages Per Minute |
| PPP | Point-to-Point Protocol |
| PPPTP | Point-to-Point Tunneling Protocol |
| PQDIF | Power Quality Data Interchange Format |
| PRAM | Parameter RAM |
| PRI | Primary-Rate Interface |
| PRL | Packetized Residential Lifeline |
| PROM | Programmable Read-Only Memory |
| PSTN | Public Switched Telephone Network |
| PTH | Plated Through-Hole |
| PUP | Potentially Unwanted Program |
| PURL | Persistent URL |
| PVC | Permanent Virtual Circuit |
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