Hanna Township is one of twenty-one townships in LaPorte County, Indiana. As of the 2020 census, its population was 976 (up from 965 at 2010) and it contained 409 housing units. It contains the census-designated place of Hanna.
According to the 2010 census, the township has a total area of , of which (or 99.51%) is land and (or 0.49%) is water.