PL

• Partit Laburista, a Maltese political party
• Liberal Party (Brazil, 2006), a Brazilian political party
• Liberal Party (Moldova), a Moldovan political party
• Liberal Party (Rwanda), a Rwandan political party
• Parlamentarische Linke, a parliamentary caucus in Germany
• Patriotic League (Bosnia and Herzegovina) (Bosnian: Patriotska Liga), a military organisation of the Republic of Bosnia and Herzegovina
• Philippine Legislature, a legislature that existed in the Philippines from 1907 to 1935
• Progressive Labor Party (United States), a United States communist party

• Palestine League, the top Palestinian football league
• Premier League, the top English football league
• Pacific League, one of the two leagues in Japan's Nippon Professional Baseball
• Pioneer Baseball League, a Rookie league in American Minor League Baseball
• Pioneer Football League, NCAA FCS conference
• Priaulx League, senior football league on the island of Guernsey

• Airstars Airways (IATA airline designator PL, 2000–2011)
• Aeroperú (IATA airline designator PL, 1973–1999)
• Papillion-La Vista Senior High School in Papillion, Nebraska, USA
• Public library, a library maintained by government for public use
• Professional Limited Liability Company, a limited liability company organized for the purpose of providing professional services

• PL postcode area, UK, a group of postcode districts in England
• Poland (ISO 3166-1 country code)

• PL Kyodan, a religious movement founded in Japan in the early 20th century
• Patrologia Latina, a collection of Catholic writings published by Jacques-Paul Migne between 1841 and 1855

• Pyridoxal, one form of vitamin B6
• Pulchellidin (Pl), an anthocyanidin
• Phospholipid, a class of lipids that are a major component of all cell membranes

• .pl, common filename suffix for Perl scripts
• .pl, common filename suffix for Prolog programs
• .pl, common filename suffix for TeX font property lists

• Programming language
• PL/C, an instructional dialect of the PL/I computer programming language, developed at Cornell University in the 1970s
• PL/I, a computer programming language developed in the 1960s
• PL/SQL, Oracle's procedural language extension (inception in 1995)
• PL/pgSQL, PostgreSQL's procedural language extension (inception 1998)

• .pl, country code top-level domain for Poland
• PL tone, a kind of squelching of an audio signal
• Packet loss, one of the three main error types encountered in digital communications
• Path loss, in telecommunication engineering
• Presentation layer, one of the seven layers in the OSI model of computer networking
• Digital Private Line, another form of tone squelching

• Piecewise linear (disambiguation), in mathematics
• Propositional logic, a system of evaluating truth-based propositions in terms of binary logic
• PL (complexity), in complexity theory

• Ice pellets (METAR weather code PL), a form of precipitation
• Picolitre (pL), and petaliter (PL), units of volume
• Pluto, a dwarf planet
• Photoluminescence, the re-emission of photons from a surface following exposure
• Pierre Levasseur (aircraft builder), a French aircraft designer
• Plastic limit, in geotechnical engineering
• PL / Positive Lock, a lens mount used on Arri cameras and lenses
• pl., abbreviation for printing plates, often indicating the number of plate-based illustrations in a book
• Adobe Prelude, an Adobe software

• Platoon leader, in the US Army
• Plural, in grammar
• Polish language (ISO 639-1 code "pl")
• Political Liberalism, a 1993 book by the American philosopher John Rawls
• Private label, an arrangement between companies regarding the exclusive sale of goods
• Public law
• Public liability

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