Mizumaki (水巻町, Mizumaki-machi) is a town located in Onga District, Fukuoka Prefecture, Japan.

Mizumaki is located in north-central Fukuoka Prefecture, bordered by Kitakyūshū City on the east and the Onga River on the west.

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

Mizumaki has a mayor-council form of government with a directly elected mayor and a unicameral town council of 14 members.

In terms of national politics, the town is part of the Fukuoka 8th district of the lower house of the Diet of Japan.