| AS | Auger Spectroscopy | - | Computer Acronyms(common) |
| AS | Absorption Spectroscopy | - | Computer Acronyms(common) |
| AS | Activated Sludge | - | Computer Acronyms(common) |
| AS | Air Stripping | - | Computer Acronyms(common) |
| AS | Auricle Sinistrus (Left Ear) | - | Medical(slang) |
| AS | Ape Sh*t | - | ISO Country Codes |
| AS | Another Subject | - | ISO Country Codes |
| AS | Adult Swim -Assamese Language (ISO 639-1 Code) - Attosecond | - | Astronomy |
| AS | American Samoa (postal Symbol; ISO 3166 Digram) - Australia (FIPS 10-4 Country Code) | - | Astronomy |
| AS | Arsenic | - | Astronomy |
| AS | Attosiemens | - | Astronomy |
| AS | application server
| - | Human Genome |
