PDL is an initialism for:
Politics Democratic Liberal Party (Partidul Democrat Liberal), a former political party in Romania Labour Democratic Party (Partito Democratico del Lavoro), a former political party in Italy Pole of Freedoms (Polo delle Libertà), a former political alliance in Italy The People of Freedom (Il Popolo della Libertà), a former political party in Italy Free Destourian Party (Parti Destourien Libre), a current political party in Tunisia Die Linke (The Left), a current political party in Germany
Science, mathematics and technology Computing Page description language Perl Data Language and the data type it supports Program Design Language, a method of software construction Progressive download Public Documentation License, used with OpenOffice.org
Other uses in science and technology PDL, a former electrical hardware manufacturer in New Zealand now part of Schneider Electric Periodontal ligament Power door locks Preferred drug list, a US formulary categorization Propositional dynamic logic Pulsed dye laser Poundal, a unit of force (abbreviated pdl) Polarization Dependent Loss, see Polarization mode dispersion
Sport Premier Development League, the former name of a developmental soccer league in the United States and Canada now known as USL League Two. Professional Development League, an English system of youth football leagues.
Other uses Padalarang railway station, a railway station in Indonesia PDL BioPharma, formerly Protein Design Labs João Paulo II Airport (IATA code PDL) Person deprived of liberty, also known as a prisoner Previously developed land, see Brownfield land Ponta Delgada Airport Poorly Drawn Lines, an absurdist webcomic Portsmouth Direct line, a railway line in England