ATIS
- Adirondack Trail Improvement Society
- Advanced traveller information system
- Adventure Thru Inner Space
- Aeta
- Alliance for Telecommunications Industry Solutions
- Allied Translator and Interpreter Section
- Atis Monteiro
- Atys (disambiguation)
- Automatic Terminal Information Service
- Automatic Transmitter Identification System (marine)
- Automatic Transmitter Identification System (television)
- Canadian Translators, Terminologists and Interpreters Council
- Hatis
- Sugar-apple