P4 may refer to:

Computing

Intel Pentium 4 Pentium 4 is a series of single-core CPUs for desktops, laptops and entry-level servers manufactured by Intel. The processors were shipped from November 20, 2000 until August 8, 2008. All Pentium 4 CPUs are based on the NetBurst microarchitect ...

, a processor series shipped from 2000 to 2008 ** The P4 power connector, introduced in the ATX12V 1.0 standard to power these and later CPUs * The i486DX (P4) model of the

Intel 80486 The Intel 486, officially named i486 and also known as 80486, is a microprocessor introduced in 1989. It is a higher-performance follow-up to the i386, Intel 386. It represents the fourth generation of binary compatible CPUs following the Inte ...

microprocessor, introduced in 1989 *

P4 (programming language) P4 is a programming language for controlling packet forwarding planes in networking devices, such as routers and switches. In contrast to a general purpose language such as C or Python, P4 is a domain-specific language with a number of cons ...

, for controlling network data forwarding * P4, the

Perforce Perforce Software, Inc. is an American developer of software used for developing and running applications, including version control software, web-based repository management, developer collaboration, application lifecycle management, web applic ...

software command line client

Media

P4 Radio Hele Norge P4 Radio Hele Norge AS Norway's leading national, private radio station with 24% national market share, about one million daily listeners and two million weekly. P4 Radio Hele Norge operates a nationwide public service-licence, with official req ...

(PFI), a Norwegian radio company ** Radio Norge, Kanal 24 (Kanal 4), which acquired the Norwegian P4 channel from PFI * Sveriges Radio P4, a Swedish radio channel * ''Persona 4'', a 2008 video game * ''Periphery IV: Hail Stan'', 2019 album by American progressive metal band Periphery

Military

* Skaraborg Regiment (armoured), a Swedish army unit, designated P 4 * Peugeot P4, a French military vehicle

Science

* P4 laboratory, a biosafety level 4 facility * Tetraphosphorus (P₄), an allotrope of phosphorus * Group p4, the plane symmetry group Wallpaper group#Group p4, wallpaper group ''p''4 * Progesterone (Pregn-4-ene-3,20-dione), a steroid hormone * Kerberos (moon), Kerberos, the fourth moon of Pluto * Perfect fourth, a musical interval * Enterobacteria phage P4 * P4, an EEG electrode site according to the 10-20 system (EEG), 10-20 system * P4 cell, a Caenorhabditis elegans#Embryonic development, stage in the ''Caenorhabditis elegans'' embryonic development * P4-metric, in statistics, a performance metric

Roads

* P4 road (Latvia) * P04 road (Ukraine)

Other uses