As a word, Ati may refer to:
The R300 GPU, introduced in August 2002 and developed by ATI Technologies, is its third generation of GPU used in Radeon graphics cards.
In differential geometry, the Atiyah–Singer index theorem, proved by Michael Atiyah and Isadore Singer (1963), states that for an elliptic differential operator on a compact manifold, the analytical index (related to the dimension of the space of solutions) is equal to the topological index (defined in terms of some topological data).
Muhammad Atif Aslam is a Pakistani singer and film actor. His movie debut was the 2011 social drama Bol.
Atilla Yayla (Turkish: [atiɫɫa jajɫa], born (1957-03-03)March 3, 1957), is a Turkish political thinker and a proponent of liberal democracy.
Atifete Jahjaga (Albanian pronunciation: [ätɪˈfeːtɛ jähˈjɑːɡä]; born 20 April 1975) is a Kosovar politician who served as the fourth President of Kosovo.
Atimura nilghirica is a species of beetle in the family Cerambycidae. It was described by Breuning in 1940.
ATI Technologies Inc. (commonly called ATI) was a semiconductor technology corporation based in Markham, Ontario, Canada, that specialized in the development of graphics processing units and chipsets.
Atikokan (Ojibwe for "caribou bones") is a township in the Rainy River District in Northwestern Ontario, Canada.
Atiku Abubakar (born 25 November 1946) is a Nigerian politician, businessman and philanthropist, who served as the second elected Vice-President of Nigeria from 1999 to 2007, on the platform of the People's Democratic Party (PDP), with President Olusegun Obasanjo.