ATO may refer to:
Atong (Atoŋ) is a Grassfields language of Cameroon.
Atō (阿東町, Atō-chō) was a town located in Abu District, Yamaguchi Prefecture, Japan.
As of 2003, the town had an estimated population of 8,006 and a density of 27.32 persons per km². The total area was 293.08 km².
On January 16, 2010, Atō was merged into the expanded city of Yamaguchi.
Coordinates: 34°24′N 131°43′E / 34.400°N 131.717°E / 34.400; 131.717
