Ati

As a word, Ati or ATI may refer to:

Ati people, a Negrito ethnic group in the Philippines
- Ati language (Philippines), the language spoken by this people group
- Ati-Atihan festival, an annual celebration held in the Philippines
Ati language (China), an unclassified Loloish language of Huaning County, Yunnan, China
Ati, a queen of the fabled Land of Punt in Africa
Ati, Chad, a town in Chad
Ati, Iran, a village in Khuzestan Province, Iran
Maha Ati, one of the nine subdivisions of Buddhist Tantra in the Nyingma school

The acronym ATI may refer to:

Academic institutions

Auckland Technical Institute, now the Auckland University of Technology, Auckland, New Zealand
Ohio State University Agricultural Technical Institute, known as Ohio State ATI
An associate of the Tax Institute of Australia

ATI Technologies, a former Canadian semiconductor company manufacturing GPUs and chipsets
Acronis True Image, cloning and backup software
Allied Telesis, a telecommunications company, formerly Allied Telesyn
Tunisian Internet Agency, also known as ATI (short for Agence tunisienne d'Internet), telecommunications company in Tunisia

Above threshold ionization, a photoelectrochemical process ionizing an atom by an excessive number of photons
Allegheny Technologies Incorporated, a specialty metals company headquartered in Pittsburgh, Pennsylvania, USA
Access to Insight, a Theravada Buddhist website
Associated Television International, a production and distribution company
Astatine monoiodide, a radioactive molecule
Amylase/trypsin inhibitor, a substance that inhibits the enzymes amylase or trypsin (see Non-celiac gluten sensitivity)