| Official Name: | Washington Township, Butler County |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Butler |
| Area Total Km2: | 93.6 |
| Area Land Km2: | 93.5 |
| Area Water Km2: | 0.1 |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 36.14 |
| Area Land Sq Mi: | 36.1 |
| Area Water Sq Mi: | 0.04 |
| Population As Of: | 2020 |
| Population Total: | 326 |
| Population Density Km2: | 3.5 |
| Population Density Sq Mi: | 9.0 |
| Elevation Footnotes: | [1] |
| Elevation M: | 314 |
| Elevation Ft: | 1030 |
| Coordinates: | 42.5956°N -92.9719°W |
| Blank Name: | FIPS code |
| Blank Info: | 19-94464[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 0468906 |
Washington Township is one of sixteen townships in Butler County, Iowa, USA. As of the 2020 census, its population was 326.[3]
Washington Township covers an area of 36.14sqmi and contains no incorporated settlements. According to the USGS, it contains two cemeteries: Memorial Park and the cemetery at Washington Reformed Church.