| Official Name: | Union Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Kansas |
| Subdivision Type2: | County |
| Subdivision Name2: | Jefferson |
| Area Total Km2: | 110.92 |
| Area Land Km2: | 110.59 |
| Area Water Km2: | 0.33 |
| Area Total Sq Mi: | 42.83 |
| Area Land Sq Mi: | 42.7 |
| Area Water Sq Mi: | 0.13 |
| Area Water Percent: | 0.3 |
| Population As Of: | 2000 |
| Population Total: | 1672 |
| Population Density Km2: | 15.1 |
| Population Density Sq Mi: | 39.2 |
| Elevation M: | 353 |
| Elevation Ft: | 1158 |
| Coordinates: | 39.2161°N -95.2175°W |
| Blank Name: | GNIS feature ID |
| Blank Info: | 0478347 |
Union Township is a township in Jefferson County, Kansas, USA. As of the 2000 census, its population was 1,672.
Union Township covers an area of 42.83 square miles (110.92 square kilometers); of this, 0.13 square miles (0.33 square kilometers) or 0.3 percent is water. The stream of Scatter Creek runs through this township.
The township contains one cemetery, Fowler.