LD
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LD can mean:
- The laserdisc video format, which looks like a huge compact disc
- Learning-disabled
- Legislative district
- The Lilian day, a version of the Julian day,
- Lincoln-Douglas Debate, a form of debate.
- The logarithm of base 2, <math>\mathrm{ld}(x)=\log_2(x)<math>, from the Latin logarithmus dualis.
- Shorthand for long distance, as with a telephone call to or from another area
- Lucid dreaming, dreaming and being aware of it
- Lethal dose, indication for a dosage (of drugs, of radiation), that kills the specified percentage of test organisms.
- Lighting designer
- Lunar distance
- the IATA code for Air Hong Kong
- In online activities, especially video games or MUDs, often used to refer to linkdead status.
- The mnemonic of instruction ld on a Z80 CPU.