P1, P01, P-1 or P.1 may refer to:

Computing, robotics, and, telecommunications

* DSC-P1, a 2000 Sony Cyber-shot P series camera model * Sony Ericsson P1, a UIQ 3 smartphone * Packet One, the first company to launch WiMAX service in Southeast Asia * Peer 1, an Internet hosting provider * Honda P1, a 1993 Honda P series of robots, an ASIMO predecessor

Media

* DR P1, a Danish radio network operated by Danmarks Radio * NRK P1, a Norwegian radio network operated by the Norwegian Broadcasting Corporation * SR P1, a Swedish radio network operated by Sveriges Radio * Polonia 1, a Polish TV channel of the Polcast Television

Military

* P-1 Hawk, a 1923 biplane fighter of the U.S. Army Air Corps * Kawasaki P-1, a Japanese maritime patrol aircraft (previously P-X) * P-1 (missile), a Soviet anti-ship cruise missile

Science

Biology

* P1 antigen, identifies P antigen system * P1 laboratory, biosafety -level-1 laboratory * P1 phage, a bacterial virus * SARS-CoV-2 Gamma variant, a strain of COVID-19 virus SARS-CoV-2 first detected in Manaus, Brazil in 2020 * ATC code P01 ''Antiprotozoals'', a subgroup of the Anatomical Therapeutic Chemical Classification System * Pericarp color1 (p1), a gene in the phlobaphene biosynthesis pathway in maize * C1 and P1 (neuroscience), a component of the visual evoked potential * P1 nuclease, a nuclease that works on single-stranded DNA as well as RNA

Other sciences

* Period 1 of the periodic table * Pollard's p − 1 algorithm for integer factorization * P-ONE - a proposed neutrino detector

Transportation

Automobiles

* P1 International, a car club founded in Leatherhead, Surrey, England * Alfa Romeo P1, a 1932 Grand Prix car * Allard P1, a 1949 British five seater two door sports saloon * McLaren P1, a sports car succeeding the McLaren F1. * Porsche P1, first electric car produced by Ferdinand Porsche in 1898 * P-1, development code name of the Subaru 1500 automobile * P1 race class in the Le Mans racing series

Aircraft

* Abrams P-1 Explorer, an American aerial survey aircraft * Dewoitine P-1, a Dewoitine aircraft * DFW P.1, a passenger aircraft development of the 1916 DFW C.V * Paradise P-1 LSA, a Brazilian light-sport aircraft

Rail

* P1 (AirTrain Newark station), a station on AirTrain Newark, NJ, USA * Alsace-Lorraine P 1, a German steam locomotives class * LNER Class P1, a locomotive designed by Nigel Gresley

Other uses

* Front-runner, or position 1 (P.1) * Papyrus 1, also known as P1, P, or , an early papyrus copy of part of the New Testament * Walther P1, an aluminum-framed variant of the Walther P38 pistol * ''Pioneer One'', an open source web series * P-1 (submarine), a fictional patrol craft in the animated TV series ''Marine Boy''