- P2P - Peer to Peer
- PB - Petabyte
- PC - Personal Computer
- PCO - Public Call Office
- PCB - Printed Circuit Board
- PCI - Peripheral Connection Interface
- PDA - Personal Digital Assistant
- PDF - Portable Document Format
- PDP - Programmed Data Processor
- PILOT - Programming Inquiring Learning or Teaching
- Pixel - Picture Element
- PIN - Personal Identification Number
- PKI - Public Key Infrastructure
- PL-1 - Programming Language 1
- PM - Primary Memory
- POB - Post Office Box
- POP - Post Office Protocol
- POS - Point Of Sale
- POST - Power On Self Test
- POTS - Plain Old Telephone Service
- PROLOG - Programming Logic
- PROM - Programmable Read Only Memory
- PS/2 - Personal System 2
- PSRAM - Pseudo Static Random Access Memory
- PSTN - Public Switched Telephone Network
- PUK - Personal Unblocking Code / Personal Unblocking Key
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