| 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: | Decatur |
| Government Type: | Indiana township |
| Leader Title: | Township Trustee |
| Leader Name: | Beverly Rivera |
| Area Total Sq Mi: | 55.24 |
| Area Land Sq Mi: | 55.07 |
| Area Water Sq Mi: | 0.17 |
| Population As Of: | 2020 |
| Population Total: | 14053 |
| Population Density Sq Mi: | auto |
| Timezone: | EST |
| Elevation Footnotes: | [1] |
| Elevation M: | 291 |
| Elevation Ft: | 955 |
| Coordinates: | 39.3369°N -85.4728°W |
| Postal Code: | 47240 |
| Area Code: | 812 |
| Blank Name: | FIPS code |
| Blank Info: | 18-80558[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 453992 |
Washington Township is one of nine townships in Decatur County, Indiana. As of the 2020 census, its population was 14,053 (up from 13,304 at 2010[3]) and it contained 6,177 housing units.[4]
Washington Township was organized in 1822.[5]
Strauther Pleak Round Barn was added to the National Register of Historic Places in 1993.
According to the 2010 census, the township has a total area of, of which (or 99.69%) is land and (or 0.31%) is water.[3]
(This list is based on USGS data and may include former settlements.)
The township contains five cemeteries: Forsythe, Saint Marys, Sand Creek, South Park and Springer.