Penn Township is one of twelve townships in Jay County, Indiana, United States.

As of the 2020 census, its population was 1,133 (down from 1,239 at 2010[2]) and it contained 530 housing units.

[3] The Rebecca Rankin Round Barn was listed on the National Register of Historic Places in 1993.

[4] According to the 2010 census, the township has a total area of 30.21 square miles (78.2 km2), of which 30.19 square miles (78.2 km2) (or 99.93%) is land and 0.02 square miles (0.052 km2) (or 0.07%) is water.

The township contains three cemeteries: Hillside, Maple Lawn and West Grove.