PN may refer to:

• Purple Noon, a 1960 film
• Patriotic Nigras, a griefing group in the game Second Life

• Pacific National, a rail freight company in Australia
• Participatory notes, issued to unregistered overseas investors in Indian stock markets
• Pennsylvania Northeastern Railroad (reporting mark PN)
• Promissory note, a contract where one party makes an unconditional promise in writing to pay a sum of money to another
• West Air (China) (IATA airline code PN)

• Pakistan Navy
• Peruvian Navy
• Philippine Navy
• Portuguese Navy

• National Renaissance Front, Partidul Naţiunii, a political party in Romania
• Partit Nazzjonalista, a political party in Malta
• Perikatan Nasional, a political coalition in Malaysia
• Partido Nacional (Uruguay), a political party in Uruguay

• Penang
• Pitcairn Islands (ISO 3166-1 country code)
• Palmerston North, a city in New Zealand
• Province of Pordenone, a province in the autonomous region of Friuli-Venezia Giulia in Italy

• Parenteral nutrition
• Phylogenetic nomenclature, an approach to naming groups of living things
• Pyridoxine, the alcohol form of vitamin B₆

• .pn, the country code top level domain (ccTLD) for Pitcairn Islands
• p–n junction, a type of junction in electronics
• Adobe Presenter, an Adobe software

• Path graph of size ${\displaystyle n}$, denoted by ${\displaystyle P_{n}}$
• Petri net, one of several mathematical modeling languages for the description of distributed systems
• Polish notation, a prefix notation proposed by Jan Łukasiewicz
• Polynomial vector spaces, denoted by ${\displaystyle \mathbb {P} _{n}}$
• Pseudorandom number sequence

• Part number, an identifier of a particular part design used in a particular industry
• Particle number, in air-quality measurement
• petanewton, a quadrillion newtons
• Planetary nebula, in astronomy
• Post-Newtonian expansion, an approximation of General Relativity
• Proportional navigation, a concept in missile guidance systems
• Pseudorandom noise, a deterministic sequence of pulses used in spread spectrum communication and rangefinding
• Phosphorus mononitride (PN), an inorganic compound found in space

• Pottery Neolithic
• Proper noun, a linguistic term for the name of an entity
• Public News, an alternative newspaper in Houston (1982-1998)

This disambiguation page lists articles associated with the title PN.
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