| Official Name: | Union Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | Randolph |
| Government Type: | Indiana township |
| Area Total Sq Mi: | 71.65 |
| Area Land Sq Mi: | 71.52 |
| Area Water Sq Mi: | 0.13 |
| Population As Of: | 2020 |
| Population Footnotes: | [1] |
| Population Total: | 1965 |
| Population Density Sq Mi: | 30 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Footnotes: | [2] |
| Elevation M: | 350 |
| Elevation Ft: | 1148 |
| Coordinates: | 40.0442°N -85.1281°W |
| Area Code: | 765 |
| Blank Name: | FIPS code |
| Blank Info: | 18-77588[3] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 453931 |
Union Township is one of eleven townships in Randolph County, Indiana, which contains the towns of Modoc and Losantville. As of the 2020 census, its population was 1,965 (down from 2,142 at 2010[4]) and it contained 902 housing units.
Union Township was established on 1 January 1951 from the merger of Nettle Creek Township and West River Township.[5]
Confusingly, another Union Township was proposed in Randolph County in 1838. This Union Township was either short lived or was never formed. It would have consisted of the northern half of the existing West River Township[6]
According to the 2010 census, the township has a total area of, of which (or 99.82%) is land and (or 0.18%) is water.[4]
(This list is based on USGS data and may include former settlements.)
Union Township has nine cemeteries: