| Official Name: | Washington Township, Adams County |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Adams |
| Area Total Km2: | 92.07 |
| Area Land Km2: | 92.01 |
| Area Water Km2: | 0.06 |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 35.55 |
| Area Land Sq Mi: | 35.53 |
| Area Water Sq Mi: | 0.02 |
| Population As Of: | 2000 |
| Population Total: | 135 |
| Population Density Km2: | 1.5 |
| Population Density Sq Mi: | 3.8 |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | North American Central Time Zone |
| Utc Offset Dst: | -5 |
| Elevation Footnotes: | [1] |
| Elevation M: | 364 |
| Elevation Ft: | 1194 |
| Coordinates: | 41.1156°N -94.7564°W |
| Blank Name: | FIPS code |
| Blank Info: | 19-94446[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 0468900 |
Washington Township is one of twelve townships in Adams County, Iowa, United States. At the 2010 census, its population was 135.[3]
Washington Township covers an area of 35.55sqmi and contains no incorporated settlements. According to the USGS (United States Geological Survey), it contains four cemeteries: Forest Hill, Homan, Mount Etna and Old Mount Etna.