SLD

SLD may refer to:

Computers and technology

 * Second-level domain, an Internet domain directly beneath the top-level domain
 * Simple learning design 2.0, a specification used to express learning activities
 * SLD resolution, the basic inference rule used in logic programming
 * Stanford Large Detector (1992–1998), for the Stanford Linear Collider
 * Superluminescent diode, a light source
 * Soft laser desorption, a laser desorption of large molecules that results in ionization without fragmentation

Graphics

 * Single-line diagram, of a 3-phase power system
 * Straight-line diagram of a road
 * Styled Layer Descriptor of map layers

Politics and law

 * Democratic Left Alliance (Poland) (Sojusz Lewicy Demokratycznej), a political party in Poland
 * Statute law database, UK

Transport

 * Salford Crescent railway station, Greater Manchester, England, National Rail station code SLD
 * Sliač Airport, Slovakia, IATA code
 * Sutherland railway station, Sydney Sutherland, Australia, station code SLD

Other uses

 * SLD glass, with low dispersion
 * Specific learning disability, disorders intrinsic to an individual
 * Supercooled Large Droplet, a type of atmospheric icing condition
 * Delta8-fatty-acid desaturase, an enzyme