SLD

• 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

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

• Democratic Left Alliance ({{lang|pl|Sojusz Lewicy Demokratycznej}}), a Polish centre-left political party
• Democratic Left Association ({{lang|pl|Stowarzyszenie Lewicy Demokratycznej}}), a political party in Poland
• Social and Liberal Democrats, former name of the Liberal Democrats (UK)
• Statute law database, UK

• 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

• SLD glass, with low dispersion
• Severe Learning Difficulties, a UK term for a level of Special Educational Needs (SEN)
• Specific learning disability, disorders intrinsic to an individual
• Supercooled Large Droplet, a type of atmospheric icing condition
• Delta8-fatty-acid desaturase, an enzyme

{{disambiguation}}