P3
- 3P (disambiguation)
- ATC code P03
- Alfa Romeo P3
- Charmed
- Cochise College Airport
- Curtiss P-3 Hawk
- DCI-P3
- DR P3
- Honda P3
- Intel 80386
- Kill A Watt
- List of Sony Cyber-shot cameras
- Lockheed P-3 Orion
- NER Class P3
- NRK P3
- P3 (AirTrain Newark station)
- P3 art and environment
- P3 group
- P3 laboratory
- P300 (neuroscience)
- PPP (disambiguation)
- PartyNextDoor 3
- Pentax P3
- Pentium III
- Period 3
- Persona 3
- Piaggio P.3
- Pilatus P-3
- Pioneer P-3
- Polish Pirate Party
- Postal III
- Primavera (software)
- Public–private partnership
- Rega Planar 3
- SARS-CoV-2 Theta variant
- Sveriges Radio P3
- Third (Portishead album)
- Volvo P3 platform