Tadaoka, Osaka

 is a town located in Senboku District, Osaka Prefecture, Japan.
As of October 2016, the town has an estimated population of 17,187 and a density of 4,300 persons per km². The total area is 4.03 km². It is the smallest town in Japan in terms of land area.
The residential area is located around the station and there are some factories at the seaside.
There are two elementary schools, a junior high school, a library and a museum. There is no high school in this town, so all high school students go to school in neighboring cities by bicycle and train.