| Official Name: | Washington Township, Adair County |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Adair |
| Area Total Km2: | 92.25 |
| Area Land Km2: | 92.1 |
| Area Water Km2: | 0.16 |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 35.62 |
| Area Land Sq Mi: | 35.56 |
| Area Water Sq Mi: | 0.06 |
| Population As Of: | 2010 |
| Population Total: | 145 |
| Population Density Km2: | 1.6 |
| Population Density Sq Mi: | 4.1 |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Footnotes: | [1] |
| Elevation M: | 359 |
| Elevation Ft: | 1178 |
| Coordinates: | 41.2°N -94.6392°W |
| Blank Name: | FIPS code |
| Blank Info: | 19-94443[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 0468899 |
Washington Township is one of seventeen townships in Adair County, Iowa, USA. At the 2010 census, its population was 145.[3]
Washington Township was organized in 1854.[4]
Washington Township covers an area of 35.62sqmi and contains no incorporated settlements. According to the USGS, it contains six cemeteries: Avondale, Campbell, Garner, Mormon, Winn and Witt.