Union Township is one of thirteen townships in Jasper County, Indiana, United States. As of the 2020 census, its population was 1,588 (a tiny increase of 1,586 from 2010) and it contained 592 housing units.
Union Township was founded in 1868.
According to the 2010 census, the township has a total area of , of which (or 99.68%) is land and (or 0.32%) is water.
The township contains one cemetery, Yeoman.
Union Township residents are eligible to obtain a free library card from the Jasper County Public Library.