LD

LD may refer to:

Arts and entertainment

 * Lighting designer, a person in charge of lighting in theatre

Film and television

 * Lorraine "L.D." Delacorte, a character on the TV series Degrassi
 * Larry David, sometimes referred to as L.D. on the television show Curb Your Enthusiasm
 * Latin Disciples, a fictional gang in television series Day Break
 * Living Dangerously, an Extreme Champion Wrestling pay-per-view event (ECW PPV)
 * Low-definition television (LDTV)
 * "-LD", a United States call sign suffix signifying a low-power digital television station

Music

 * Lil Dicky (born 1988), American rapper
 * Little Doses, a Scottish alternative rock band
 * Luis Dubuc (born 1985), American musician
 * LD (rapper), British rapper
 * Lemon Demon, American musical project and band

Businesses and organizations

 * Air Hong Kong (IATA code LD)
 * Light Dragoons, a British Army cavalry regiment
 * Línea Turística Aereotuy (IATA code LD)
 * Louis Dreyfus Company, a French commodities trading firm

Contract law

 * Liability damages
 * Liquidated damages

Currencies

 * Liberian dollar, the currency of Liberia
 * Libyan dinar, the currency of Libya
 * Liberty dollar (private currency), produced in the US

Products

 * LD (cigarette), a brand of cigarette

Places

 * LD postcode area, also known as the Llandrindod Wells postcode area, in Wales
 * Lakshadweep, India (ISO 3166-2 code LD)
 * County Longford, Ireland (code LD)

Politics

 * Liberal democracy, a form of government based on rule of the people (democracy) tempered by the rule of law and natural rights (liberalism)
 * Lincoln–Douglas debate, a form of debate
 * Liberal Democrats (UK), a UK political party
 * Lord, a peer of the realm in the United Kingdom

Astronomy

 * Lilian day, a variant of the Julian day
 * Lunar distance (astronomy), the distance between the Earth and the Moon, used a general measure of distance

Biology and medicine

 * Lactate dehydrogenase, an enzyme in plants and animals
 * Lateral dorsal nucleus of thalamus, an anatomic structure of the brain
 * Learning disability, a condition that can impair learning through standard methods
 * Lethal dose, an indication of the lethal toxicity of a given substance or type of radiation
 * Licensed Dietitian
 * Linkage disequilibrium, in genetics, when alleles occur together more often than they would by chance
 * Lucid dreaming, a dream in which one is conscious of dreaming as it is happening

Electronics and computing

 * ld, an instruction on a Z80 CPU
 * ld (Unix), the linker command on Unix and Unix-like systems
 * Laser diode, semiconductor laser-emitting device
 * LaserDisc, an obsolete optical disc video/data format and predecessor to DVD
 * Levenshtein distance, a string metric for measuring the difference between two sequences.
 * Line Dubbed, a term for unlicensed copies of films with an audio track, which has been ripped from the line out connection of a projector
 * Linked data, a method of publishing structured data so that it can be interlinked and become more useful
 * The 'Linked Document' in the NISO standard Content Profile/Linked Document, a data serialisation format
 * Listening device, used in covert investigations

Telecommunications

 * Long-distance calling, a telephone call charged at a higher rate
 * Loop Disconnect dialing

Other

 * (chemistry) D/L nomenclature, used in naming chemical compounds
 * (linguistics) Language Development, the changes that take place in language, speech & communication in the context of children's development
 * (manufacturing) Linz-Donawitz process, a widely-used process in Basic oxygen steelmaking
 * (mathematics) Binary logarithm, $$\mathrm{ld}(x)=\log_2(x)$$, from the Latin logarithmus dualis
 * (military) Laser designator, used by the military for targeting
 * (physics) London dispersion force, weak intermolecular forces

Other uses

 * (communications) Lincoln–Douglas debate format
 * (sociology) Long-distance relationship
 * (sports) Line drive, in baseball
 * (sports) Ludum Dare, a game development competition