| Official Name: | Union Township, Calhoun County |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Calhoun |
| Area Total Km2: | 91.86 |
| Area Land Km2: | 91.86 |
| Area Water Km2: | 0 |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 35.47 |
| Area Land Sq Mi: | 35.47 |
| Area Water Sq Mi: | 0 |
| Population As Of: | 2000 |
| Population Total: | 573 |
| Population Density Km2: | 6.2 |
| Population Density Sq Mi: | 16.2 |
| Elevation Footnotes: | [1] |
| Elevation M: | 356 |
| Elevation Ft: | 1168 |
| Coordinates: | 42.2511°N -94.5822°W |
| Blank Name: | FIPS code |
| Blank Info: | 19-94179[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 0468811 |
Union Township is one of sixteen townships in Calhoun County, Iowa, United States. As of the 2000 census, its population was 573.
Union Township was created in 1878.[3]
Union Township covers an area of 35.47sqmi and contains one incorporated settlement, Lohrville. According to the USGS, it contains two cemeteries: Evergreen and Evergreen.