Harrison Township is one of thirteen townships in Henry County, Indiana, United States. As of the 2010 census, its population was 1,352 and it contained 587 housing units.
Harrison Township was organized in 1838.
Henry F. Whitelock House and Farm was added to the National Register of Historic Places in 1983.
According to the 2010 census, the township has a total area of , of which (or 99.78%) is land and (or 0.22%) is water. The streams of Bone Run, Cadiz Run, Clear Spring, Down Run, Hendricks Brook, Jakes Branch, Owner Run and Quaker Run run through this township.
The township contains two cemeteries: Hess, Cadiz Friends, Clear Springs, & Quaker. Also, there is the Hedrick cemetery located on the Grant City Rd. 1/4 mile south of the CENTRAL AVENUE rd.