Shintomi is a town in Koyu District, Miyazaki Prefecture, Japan. It is located in the Miyazaki region on the island of Kyushu.
As of 1 October 2023, the town had an estimated population of 16,117 people living in 6,593 households, giving it a population density of 260 persons per square kilometre. The total area of Shintomi is 61.53 square kilometres (23.76 square miles).