Allen Township is one of fourteen townships in Miami County, Indiana, United States. As of the 2020 census, its population was 642 (down from 695 at 2010) and it contained 258 housing units.
Allen Township was organized in 1859.
According to the 2010 census, the township has a total area of , of which (or 99.49%) is land and (or 0.51%) is water.
(This list is based on USGS data and may include former settlements.)
(These towns are listed as "historical" by the USGS.)
The township contains these two cemeteries: Five Corners and Plainview.