P5 may refer to:
- P-5 Hawk, a 1923 aircraft
- Martin P5M Marlin, flying boat
- Rover P5, series (commonly called 3-Litre and 3½ Litre for the engine displacement) was a group of saloon and coupé automobiles produced from 1958 until 1973
- Palatine P 5, a 1908 locomotive
- PRR P5, comprised 92 mixed-traffic electric locomotives constructed 1931–1935 by the PRR, Westinghouse and General Electric
- P5, IATA airline code of Copa Airlines Colombia (formerly AeroRepublica)
- Itau-Unibanco Protocols, a protocol created for fast applications be slower.
- Protege5, 5 door sport-wagon produced by Mazda from 2002-2003
- P5 Glove, input device for human-computer interaction
- P5 (microarchitecture), Intel Pentium, 5th generation central processing unit introduced in 1993
- System p5, family of servers and workstations created in 2005 as part of IBM System p
- P5, a shortened name for Processing (programming language)
- P5, an abbreviation for Perl version 5
- Weapons and military
- P-5 Pyatyorka, a 1959 cold war era anti-shipping missile of the Soviet Union
- Walther P5, a pistol made by German arms maker Walther in the 1970s
- P5, a designation for Norrbottens pansarbataljon, a Swedish Army armoured battalion active since 1957
- United Nations
- P5+1, the five permanent members of the UN Security Council plus Germany, coined for the states joined in the diplomatic efforts over Iran's nuclear program
- P5, the five permanent members of the United Nations Security Council
- Perfect fifth, a music interval
- Pizzicato Five, a Shibuya-kei group
- Bowers & Wilkins P5 headphone - a high-end headphones by B&W
- Other uses
- P5 (comics), a comic strip also known as Class Act in the UK comic The Dandy
- P5 Truss Segment, an element of the International Space Station
- Period 5 of the periodic table
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