| Official Name: | Harrison Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | Cass |
| Government Type: | Indiana township |
| Area Total Km2: | 91.93 |
| Area Land Km2: | 91.93 |
| Area Water Km2: | 0 |
| Area Total Sq Mi: | 35.49 |
| Area Land Sq Mi: | 35.49 |
| Area Water Sq Mi: | 0 |
| Population As Of: | 2020 |
| Population Footnotes: | [1] |
| Population Total: | 747 |
| Population Density Km2: | auto |
| Elevation Footnotes: | [2] |
| Elevation M: | 243 |
| Elevation Ft: | 797 |
| Coordinates: | 40.8661°N -86.405°W |
| Blank Name: | FIPS code |
| Blank Info: | 18-31666[3] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 453380 |
Harrison Township is one of fourteen townships in Cass County, Indiana. As of the 2020 census, its population was 747 (down from 802 at 2010[4]) and it contained 323 housing units.
Harrison Township was organized in 1836.[5] It was named for William Henry Harrison, who had served as Governor of the Indiana Territory, congressman, senator, and who would afterward serve as the ninth President of the United States.[6]
Harrison Township covers an area of, all land.
The township contains four cemeteries: Crooked Creek, Grant, Old Indian Creek and Saint Elizabeth.