Ati

Ati may refer to:

* Ati, Chad, a town in Chad
* Ati (tribe), a Negrito ethnic group in the Philippines
* Ati-Atihan Festival, an annual celebration held in the Philippines
* A queen of the fabled Land of Punt in Africa

As an acronym, ATI may refer to:
* ATI Technologies Inc., a technology company and a subsidiary of AMD
* ATI - Advisor Turning Independent, a financial advisor who currently works at a brokerage house thinking about starting his or her own brokerage service
* ATI - Aero Trasporti Italiani, a defunct Italian airline
* Acronis True Image, a software product
* Air Transport International, a charter cargo airline
* Allegheny Technologies, a steel company, ATI on the New York Stock Exchange
* Allied Telesis, a telecommunications company, formerly Allied Telesyn
* Auckland Technical Institute, now the Auckland University of Technology
* Ohio State University Agricultural Technical Institute
* Tunisian Internet Agency ("Agence tunisienne d'Internet"), a Tunisian ISP