| Official Name: | Washington Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Chickasaw |
| Area Total Km2: | 139.05 |
| Area Land Km2: | 139.05 |
| Area Water Km2: | 0 |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 53.69 |
| Area Land Sq Mi: | 53.69 |
| Area Water Sq Mi: | 0 |
| Area Water Percent: | 0 |
| Population As Of: | 2000 |
| Population Total: | 954 |
| Population Density Km2: | 6.9 |
| Population Density Sq Mi: | 17.8 |
| Elevation M: | 357 |
| Elevation Ft: | 1171 |
| Coordinates: | 43.1458°N -92.3767°W |
| Blank Name: | GNIS feature ID |
| Blank Info: | 0468909 |
Washington Township is one of twelve townships in Chickasaw County, Iowa, USA. As of the 2000 census, its population was 954.
Washington Township covers an area of 53.69sqmi and contains two incorporated settlements: Alta Vista and North Washington. According to the USGS, it contains four cemeteries: Calvary, Eggleston Farm, Saint Marys and Union.
Washington Township contains one airport or landing strip, New Hampton Municipal Airport.