| Official Name: | Washington Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Missouri |
| Subdivision Type2: | County |
| Subdivision Name2: | Buchanan |
| Area Total Km2: | 213 |
| Area Land Km2: | 207.46 |
| Area Water Km2: | 5.55 |
| Area Total Sq Mi: | 82.24 |
| Area Land Sq Mi: | 80.1 |
| Area Water Sq Mi: | 2.14 |
| Area Water Percent: | 2.61 |
| Population As Of: | 2010 |
| Population Total: | 78865 |
| Population Density Km2: | 364.9 |
| Population Density Sq Mi: | 945 |
| Elevation Footnotes: | [1] |
| Elevation M: | 268 |
| Elevation Ft: | 879 |
| Coordinates: | 39.7622°N -94.83°W |
| Blank Name: | FIPS code |
| Blank Info: | 29-77236[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 0766346 |
Washington Township is one of twelve townships in Buchanan County, Missouri, USA. As of the 2010 census, its population was 78,865.[3]
Washington Township was established in 1842, and named after President George Washington.[4]
Washington Township covers an area of 82.24sqmi and contains one incorporated settlement, St. Joseph (the county seat). It contains nine cemeteries: Ashland, B'nai Sholem, Memorial Park, Mount Auburn, Mount Mora, Mount Olivet, Nelson, Ozenberger and Walnut Grove.
Browning Lake and Lake Contrary are within this township. The streams of Candy Creek, Roys Branch and Whitehead Creek run through this township.
Washington Township contains three airports or landing strips: Butchs Strip, Mosaic Hospital West Heliport and Rosecrans Memorial Airport.