Plan - Pour
- Planet carrier
- Planet wheel
- Planetary gear
- Planetary transmission
- Planing machine (planer)
- Plastics
- Plate clutch
- Platform
- Platform truck
- Play
- Pliers
- Plug
- Plug head
- Plunger
- Plunger pump
- Ply rating
- Pneumatic horn
- Pneumatic suspension
- Pneumatic tyre
