| Official Name: | Union Township, Adams County |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Adams |
| Area Total Km2: | 91.18 |
| Area Land Km2: | 91.17 |
| Area Water Km2: | 0.01 |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 35.2 |
| Area Land Sq Mi: | 35.2 |
| Area Water Sq Mi: | 0.01 |
| Population As Of: | 2010 |
| Population Total: | 144 |
| Population Density Km2: | 1.6 |
| Population Density Sq Mi: | 4.1 |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Footnotes: | [1] |
| Elevation M: | 365 |
| Elevation Ft: | 1198 |
| Coordinates: | 41.0294°N -94.5281°W |
| Blank Name: | FIPS code |
| Blank Info: | 19-94164[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 0468806 |
Union Township is one of twelve townships in Adams County, Iowa, United States. At the 2010 census, its population was 144.[3]
Union Township covers an area of 35.2sqmi and contains no incorporated settlements. According to the USGS, it contains one cemetery, Summit.