| 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: | Knox |
| Government Type: | Indiana township |
| Area Total Sq Mi: | 80.36 |
| Area Land Sq Mi: | 79.11 |
| Area Water Sq Mi: | 1.25 |
| Population As Of: | 2020 |
| Population Total: | 1921 |
| Population Density Sq Mi: | auto |
| Elevation Footnotes: | [1] |
| Elevation M: | 140 |
| Elevation Ft: | 459 |
| Coordinates: | 38.5892°N -87.3528°W |
| Blank Name: | FIPS code |
| Blank Info: | 18-31864[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 453390 |
Harrison Township is one of ten townships in Knox County, Indiana. As of the 2020 census, its population was 1,921 (slightly up from 1,916 at 2010[3]) and it contained 867 housing units.[4]
Harrison Township was founded in 1801. It was named for General William Henry Harrison, an American military officer and ninth President of the United States.[5]
According to the 2010 census, the township has a total area of, of which (or 98.44%) is land and (or 1.56%) is water.[3]