Union Township is one of seven townships in Perry County, Indiana, United States. As of the 2020 census, its population was 591 and it contained 287 housing units.
The Rockhouse Cliffs Rock Shelters was listed on the National Register of Historic Places in 1986.
According to the 2010 census, the township has a total area of , of which (or 98.03%) is land and (or 1.97%) is water.
(This list is based on USGS data and may include former settlements.)
The township contains these seven cemeteries: Badger, Derby, Horton, Old Chapel, Phelps, Stephenson and Talley.