| Official Name: | Union Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Ohio |
| Government Type: | Indiana township |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 11.61 |
| Area Land Sq Mi: | 11.52 |
| Area Water Sq Mi: | 0.09 |
| Area Water Percent: | 0.78 |
| Population As Of: | 2020 |
| Population Total: | 447 |
| Population Density Sq Mi: | auto |
| Elevation M: | 190 |
| Elevation Ft: | 623 |
| Coordinates: | 38.9878°N -84.9669°W |
| Postal Code Type: | ZIP codes |
| Postal Code: | 47001, 47018, 47040 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 453927 |
Union Township is one of four townships in Ohio County, Indiana, United States. As of the 2020 census, its population was 447 and it contained 203 housing units.[1]
According to the 2010 census, the township has a total area of, of which (or 99.22%) is land and (or 0.78%) is water.[2] Union is the smallest township by area in the state.
(This list is based on USGS data and may include former settlements.)