| P/L | Production Line 
| Others |
| P/L | Purchased Labor
| Others |
| P/M | Payload Module
| Others |
| P/M/C | Passengers/mail/cargo
| Others |
| P/N | Part Number
| Others |
| P/N | Post Natal
| Others |
| P/O | Part Of
| Others |
| p/o | postoperative
| Others |
| P/P | Patch Panel
| Others |
| P/P | Patch Panel P-P Peak-To-Peak
| Others |
| P/P | Pier to Pier
| Others |
| P/P | Printer/Plotter
| Others |
| P/PL | Primary Payload
| Others |
| P/S | Parallel-to-Serial Converter
| Others |
| P/S | Payload Specialist
| Others |
| P/S | Post Scriptum
| Others |
| P/S | Price-to-Sales ratio
| Others |
| P/T | Part-Time
| Others |
| P/U | Postally Used
| Others |
| P/X | Part Exchange
| Others |
| P/Y | Pitch/Yaw
| Others |
| P02 | Partial pressure of Oxygen
| Others |
| P1 | (filtering face)Piece 1 (protects against large, solid particles)
| Others |
| P1 | Port 1
| Others |
| P1 casualty | Priority 1 casualty
| Others |
| P10 | Tektronix Plot 10 drawing
| Others |
| P100 | Strongly resistant to oil, 100%(99.97%) of particles
| Others |
| P16 | ProTracker Studio 16 16-channel Music file
| Others |
| P1M | Priority 1 Metallic
| Others |
| P1NP | Procollagen type I N-terminal Propeptide
| Others |
| P1P | Phase 1 Plant
| Others |
| P1P | Phyto-sphingosine-1-Phosphate
| Others |
| P1PWAO | Putting 1 Piece With AnOther
| Others |
| P2 | (filtering face)Piece 2 (protects against solid and liquid irritating aerosols)
| Others |
| P2 | Pentium II
| Others |
| P2 | Player 2
| Others |
| P2 | Pollution Prevention
| Others |
| P2 | Portal 2
| Others |
| P2 casualty | Priority 2 casualty
| Others |
| P22 | Patch file (Patch22)
| Others |
| P22 | Vermillion Block 131 Automated Meteorological Observing Station, Gulf of Mexico
| Others |
| P25 | Vermillion Block 215 Automated Meteorological Observing Station, Gulf of Mexico
| Others |
| P2A | Person to Account
| Others |
| P2A | Phone to Account
| Others |
| P2C | Path 2 Change
| Others |
| P2C | Pci to Cpu
| Others |
| P2C | Phone to Car
| Others |
| P2C | Police to Citizen
| Others |
| P2C | Power To Change
| Others |
| P2C2 | Pantone Personal Color Calibrator
| Others |