Ōtō (大任町, Ōtō-machi) is a town located in Tagawa District, Fukuoka Prefecture, Japan.

Fukuoka Prefecture Ōtō has a humid subtropical climate (Köppen Cfa) characterized by warm summers and cool winters with light to no snowfall.

Ōtō has a mayor-council form of government with a directly elected mayor and a unicameral town council of 11 members.

Ōtō, collectively with the other municipalities of Tagawa District contributes two members to the Fukuoka Prefectural Assembly.

In terms of national politics, the town is part of the Fukuoka 11th district of the lower house of the Diet of Japan.