Posey Township is one of thirteen townships in Franklin County, Indiana, United States. As of the 2020 census, its population was 1,040, down from 1,051 at 2010.
Posey Township is named for Thomas Posey, second Governor of Indiana Territory.
According to the 2010 census, the township has a total area of , of which (or 99.67%) is land and (or 0.33%) is water.
(This list is based on USGS data and may include former settlements.)
The township contains four cemeteries: Old Brick, Old Brick, Young Brick and Middle Brick.
Posey Township residents may obtain a free library card from the Franklin County Public Library District in Brookville.