P4
| Acronym | Definition |
|---|---|
| P4 | Pentium IV (Intel microprocessor) |
| P4 | Persona 4 (game) |
| P4 | Primary 4 (various schools) |
| P4 | Progesterone (hormone) |
| P4 | Perforce (software vendor) |
| P4 | Phosphorus |
| P4 | Perfect Fourth (music) |
| P4 | Postnatal Day 4 |
| P4 | Personal For (US Navy) |
| P4 | Prevent Polythene - Protect Planet (India; eco-campaign) |
| P4 | Product, Price, Promotion and Place (marketing analysis tool) |
| P4 | Photolithographic Pattern Plated Probe |