| Official Name: | Union Township, Adair County |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Adair |
| Area Total Km2: | 92.95 |
| Area Land Km2: | 92.79 |
| Area Water Km2: | 0.17 |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 35.89 |
| Area Land Sq Mi: | 35.83 |
| Area Water Sq Mi: | 0.06 |
| Population As Of: | 2010 |
| Population Total: | 177 |
| Population Density Km2: | 1.9 |
| Population Density Sq Mi: | 4.9 |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Footnotes: | [1] |
| Elevation M: | 366 |
| Elevation Ft: | 1201 |
| Coordinates: | 41.2006°N -94.2986°W |
| Blank Name: | FIPS code |
| Blank Info: | 19-94161[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 0468805 |
Union Township is one of seventeen townships in Adair County, Iowa, USA. At the 2010 census, its population was 177.[3]
Union Township was first settled in 1853.[4]
Union Township covers an area of 35.89sqmi and contains no incorporated settlements. According to the USGS, it contains three cemeteries: Hill of Zion, Liberty and Wilson.