PLN

PLN or pln may refer to:

Organisations

 * Liberal Nationalist Party (Spanish: Partido Liberal Nacionalista), a former political party of Nicaragua
 * National Liberal Party (Panama) (Spanish: Partido Liberal Nacional), a political party of Panama
 * National Liberation Party (Costa Rica) (Spanish: Partido Liberación Nacional), a political party of Costa Rica
 * Perusahaan Listrik Negara, Indonesian government-owned electricity company

Science and technology

 * Power line networking, the use of electrical power lines for data transmission
 * Phospholamban or PLN, a protein that regulates calcium in muscle cells
 * Pln, the abbreviation for the orchid genus Pleione
 * .pln, a file extension used by SilkTest
 * Probabilistic logic network

Other uses

 * Polish złoty, ISO 4217 currency code
 * Pellston Regional Airport, IATA airport code, a commercial airport in Pellston, Michigan
 * Personal learning network
 * Picton, Lennox and Nueva, a group of three Chilean islands near the southern extreme of South America, disputed by Argentina
 * Port letter and number, a code identifying fishing vessels and other boats printed on the boat
 * The initials of Paul Newman