Harrison Township is one of sixteen townships in Elkhart County, Indiana. As of the 2010 census, its population was 4,435.
Harrison Township was established in the 1830s, and named for William Henry Harrison.
The Joseph J. Rohrer Farm and St. John's Lutheran Church are listed on the National Register of Historic Places.
According to the 2010 census, the township has a total area of , of which (or 99.92%) is land and (or 0.08%) is water. Yellow Creek Lake is in this township.
The township contains six cemeteries: Hoke, Inbody, Miller, Stutsman, Wenger and Yellow Creek.
Harrison Township residents are eligible to obtain a library card at the Wakarusa-Olive & Harrison Township Public Library in Wakarusa.