| P2P | Peer To Peer | - | Computer and Internet |
| PC | Personal Computer | - | Computer and Internet |
| PCB | Printed Circuit Board | - | Computer and Internet |
| PCI | Peripheral Component Interconnect | - | Computer and Internet |
| PCI-X | Peripheral Component Interconnect Extended | - | Computer and Internet |
| PCMCIA | Personal Computer Memory Card International Association | - | Computer and Internet |
| PDA | Personal Digital Assistant | - | Computer and Internet |
| PDF | Portable Document Format | - | Computer and Internet |
| PHP | Hypertext Preprocessor | - | Computer and Internet |
| PIM | Personal Information Manager | - | Computer and Internet |
| PMU | Power Management Unit | - | Computer and Internet |
| PNG | Portable Network Graphic; Image Format | - | Computer and Internet |
| POP3 | Post Office Protocol | - | Computer and Internet |
| PPC | Pay Per Click | - | Computer and Internet |
| PPGA | Plastic Pin Grid Array | - | Computer and Internet |
| PPI | Pixels Per Inch | - | Computer and Internet |
| PPL | Pay Per Lead | - | Computer and Internet |
| PPM | Pages Per Minute | - | Computer and Internet |
| PPP | Point To Point Protocol | - | Computer and Internet |
| PPTP | Point-to-Point Tunneling Protocol | - | Computer and Internet |
| PRAM | Parameter Random Access Memory | - | Computer and Internet |
| PS/2 | Personal System/2 | - | Computer and Internet |