| Official Name: | Union Township, Carroll County |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Carroll |
| Area Total Km2: | 93.56 |
| Area Land Km2: | 93.56 |
| Area Water Km2: | 0 |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 36.12 |
| Area Land Sq Mi: | 36.12 |
| Area Water Sq Mi: | 0 |
| Population As Of: | 2000 |
| Population Total: | 1532 |
| Population Density Km2: | 16.4 |
| Population Density Sq Mi: | 42.4 |
| Elevation Footnotes: | [1] |
| Elevation M: | 352 |
| Elevation Ft: | 1155 |
| Coordinates: | 41.9075°N -94.6819°W |
| Blank Name: | FIPS code |
| Blank Info: | 19-94182[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 0468812 |
Union Township is one of eighteen townships in Carroll County, Iowa, USA. As of the 2000 census, its population was 1,532.
Union Township covers an area of 36.12sqmi and contains one incorporated settlement, Coon Rapids. According to the USGS, it contains four cemeteries: Coon Rapids, Oak Hill, Old Carrollton and Union.