| Official Name: | Washington Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | Harrison |
| Government Type: | Indiana township |
| Area Total Sq Mi: | 21.09 |
| Area Land Sq Mi: | 20.77 |
| Area Water Sq Mi: | 0.32 |
| Population As Of: | 2020 |
| Population Total: | 479 |
| Population Density Sq Mi: | auto |
| Elevation Footnotes: | [1] |
| Elevation M: | 198 |
| Elevation Ft: | 650 |
| Coordinates: | 38.1103°N -86.2414°W |
| Blank Name: | FIPS code |
| Blank Info: | 18-80684[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 453999 |
Washington Township is the smallest of twelve townships in Harrison County, Indiana. As of the 2020 census, its population was 479 and it contained 215 housing units.[3]
Washington Township's first settlers were Jacob and Henry Funk and their families who settled in the area in 1805. Their farm was located on the river flat where Indian Creek flows into the Ohio River.
In 1986, an early archaic Indian site was excavated in the western part of the township, the Swan's Landing Archeological Site.
According to the 2010 census, the township has a total area of, of which (or 98.48%) is land and (or 1.52%) is water.[4]
The only town in Washington Township is New Amsterdam, Indiana, located along the Ohio River. The unincorporated community of Valley City is also located there.