P3, P-3, P.3, or P03 may refer to:

Arts and entertainment P3 art and environment, an arts organisation in Tokyo, Japan P3, a fictional nightclub in the television series Charmed

Music PartyNextDoor 3, a 2016 album by PartyNextDoor

Radio stations DR P3, Denmark NRK P3, Norway Sveriges Radio P3, Sweden

Organizations P3 group, a German engineering consultancy Polish Pirate Party, a political party in Poland P3 International, the maker of Kill A Watt electricity usage meters P3 America, Britain and France as nuclear powers

Mathematics p3 (symmetry group) P3, a trigonal space group P, a trigonal space group

Science and medicine P3 laboratory, a biosafety-level-3 laboratory P3 peptide P3 protein ATC code P03 Ectoparasiticides, including scabicides, insecticides and repellents, a subgroup of the Anatomical Therapeutic Chemical Classification System P300 (neuroscience) or P3, a neural evoked potential component of the electroencephalogram (EEG)

Technology Honda P3, a robot Pentax P3, a camera model Pindad P3, a pistol Pioneer P-3, an intended lunar orbiter probe P3, successor to the Rega Planar 3 LP record player Sony Cyber-shot DSC-P3, a Sony Cyber-shot camera

Computing DCI-P3, a color space used for some monitors and projectors Intel 80386, the third processor in the x86 line Pentium III, a brand of microprocessors Primavera (software), or Primavera Project Planner, a project management software package

Transportation P3 (AirTrain Newark station) NER Class P3, a locomotive P3, a national road in Latvia

Automobiles Alfa Romeo P3, a racing car Ford Taunus P3, a mid-sized saloon Rover P3, an executive car Volvo P3 platform, an automobile platform

Aviation Curtiss P-3 Hawk, an American fighter aircraft of the 1920s Lockheed P-3 Orion, an American maritime patrol aircraft Piaggio P.3, an Italian night bomber prototype of the 1920s Pilatus P-3, a Swiss military training aircraft of the 1950s Cochise College Airport in Cochise County, Arizona

Other uses Public–private partnership, a type of business venture

See also 3P (disambiguation) PPP (disambiguation)