As a word, Ati may refer to:
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.
Atifete Jahjaga (Albanian pronunciation: [ätɪˈfeːtɛ jähˈjɑːɡä]; born 20 April 1975) is a Kosovar politician who served as the fourth President of Kosovo.
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.
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.
Atikokan (Ojibwe for "caribou bones") is a township in the Rainy River District in Northwestern Ontario, Canada.
Atiba Hutchinson (born February 8, 1983) is a Canadian professional soccer player who is currently playing for Beşiktaş and the Canadian national team as a midfielder.
The R200 is the second generation of GPUs used in Radeon graphics cards and developed by ATI Technologies.
Atiu, also known as Enuamanu (meaning land of the birds), is an island 187 km northeast of Rarotonga, in the Southern Islands group of the Cook Islands Archipelago.