Kanzaki is a city located in Saga Prefecture, Japan. It lies in the northern part of the prefecture on the island of Kyushu.
As of 30 April 2024, the city had an estimated population of 30,329 people living in 12,440 households, giving a population density of 240 persons per square kilometre. The total area of the city is 125.13 square kilometres (48.31 square miles).