Posey Township is one of eleven townships in Clay County, Indiana. As of the 2020 census, its population was 4,016 (down from 4,063 at 2010) and it contained 1,682 housing units.
Posey Township was organized in 1828. It was named for Territorial Governor Thomas Posey.
According to the 2010 census, the township has a total area of , of which (or 98.01%) is land and (or 1.99%) is water.
(This list is based on USGS data and may include former settlements.)
The township contains seven cemeteries: Billtown, Clearview, Cottage Hill, German, Rhule, Summit Lawn and Summit Lawn.