Harrison Township is one of six townships in Union County, Indiana, United States. As of the 2020 census, its population was 429 and it contained 176 housing units.
According to the 2010 census, the township has a total area of , of which (or 99.93%) is land and (or 0.07%) is water.
(This list is based on USGS data and may include former settlements.)
The township contains these two cemeteries: Nutter and Railsback.