As or AS may stand for:

• Advanced Supplementary - A'-levels
• American Samoa, ISO country code
• arsenic (As), chemical symbol for the chemical element
• As in mythology:
  • in Norse mythology refers to the Aesir.
  • in Egyptian mythology is an alternate spelling for Ash (god).
• As (municipality) in Belgium
• As (coin) in Ancient Rome valued at 1/16 of a denarius
• Asperger Syndrome

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