| 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: | Cass |
| Government Type: | Indiana township |
| Area Total Km2: | 91.53 |
| Area Land Km2: | 91.07 |
| Area Water Km2: | 0.46 |
| Area Total Sq Mi: | 35.34 |
| Area Land Sq Mi: | 35.16 |
| Area Water Sq Mi: | 0.18 |
| Population As Of: | 2020 |
| Population Footnotes: | [1] |
| Population Total: | 1557 |
| Population Density Km2: | auto |
| Elevation Footnotes: | [2] |
| Elevation M: | 218 |
| Elevation Ft: | 715 |
| Coordinates: | 40.6964°N -86.3319°W |
| Blank Name: | FIPS code |
| Blank Info: | 18-80432[3] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 453986 |
Washington Township is one of fourteen townships in Cass County, Indiana, and one of the forty-six townships sharing the name in the state.[4] As of the 2020 census, its population was 1,557 (down from 1,608 at 2010[5]) and contained 708 housing units.
Washington Township was organized in 1842.[6] It was named for George Washington, first President of the United States.[7]
Washington Township covers an area of ; (0.51 percent) of this is water.
The township contains four cemeteries: Bruner, Ramer, Taber and West.