as, As or AS may stand for:

as

• A conjunction or preposition in the English language with various meanings.
• as in Unix is the standard command line assembler.

As

• Chemistry
  • arsenic (As), chemical symbol for the chemical element
• Mythology:
  • in Norse mythology refers to the Aesir.
  • in Egyptian mythology is an alternate spelling for Ash (god).
• Geography:
  • As (municipality) in Belgium
  • Ås, Krokoms kommun, Sweden
  • Ås, Nora kommun, Sweden
  • Ås, Gislaveds kommun, Sweden
  • Aš is a town in Czech Republic
• Assamese language (ISO 639 alpha-2)
• As (coin) in Ancient Rome valued at 1/16 of a denarius

AS

• American Samoa, ISO 3166-1 country code
• AS is the US Navy hull classification symbol for Submarine Tender
• The AS, a small French car.
• In economics, AS is usually used to represent aggregate supply.
• the IATA code for Alaska Airlines

?

• Advanced Subsidiary - A-levels
• Adult Swim, a comedy television block on the Cartoon Network.
• Aortic stenosis
• Asperger's syndrome
• Ankylosing spondylitis
• Autonomous system (Internet)
• Actionscript, a programming language