Thandaunggyi Township (Phlone: ; ; ) is the only township of Thandaunggyi District () in northern Kayin State of Myanmar. The principal town is Thandaunggyi. The township has four towns and 341 villages grouped into 59 village tracts.
In 2014, the township had 30,209 people. By 2023, the population had grown significantly to 93,642 people.
The township contains the following towns for a total urban population of 20,192 people.