| Official Name: | Union Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Iowa |
| Subdivision Type2: | County |
| Subdivision Name2: | Benton |
| Area Total Km2: | 92.92 |
| Area Land Km2: | 92.92 |
| Area Water Km2: | 0 |
| Area Total Sq Mi: | 35.88 |
| Area Land Sq Mi: | 35.88 |
| Area Water Sq Mi: | 0 |
| Area Water Percent: | 0 |
| Population As Of: | 2000 |
| Population Total: | 996 |
| Population Density Km2: | 10.7 |
| Population Density Sq Mi: | 27.8 |
| Elevation M: | 280 |
| Elevation Ft: | 919 |
| Coordinates: | 41.9892°N -92.1178°W |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Postal Code Type: | ZIP codes |
| Postal Code: | 52209, 52249, 52257, 52346 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 0468808 |
Union Township is one of twenty townships in Benton County, Iowa, United States. As of the 2000 census, its population was 996.[1]
According to the United States Census Bureau, Union Township covers an area of 35.88 square miles (92.92 square kilometers).
The township contains these two cemeteries: Bender and Calvary Catholic.