| Official Name: | Union Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Miami |
| Government Type: | Indiana township |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 21.82 |
| Area Land Sq Mi: | 21.73 |
| Area Water Sq Mi: | 0.08 |
| Area Water Percent: | 0.37 |
| Population As Of: | 2020 |
| Population Footnotes: | [1] |
| Population Total: | 764 |
| Population Density Sq Mi: | auto |
| Elevation Footnotes: | [2] |
| Elevation M: | 247 |
| Elevation Ft: | 810 |
| Coordinates: | 40.8997°N -86.1242°W |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Postal Code Type: | ZIP codes |
| Postal Code: | 46921, 46926, 46951 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 453925 |
Union Township is one of fourteen townships in Miami County, Indiana, United States. As of the 2020 census, its population was 764 (down from 857 at 2010[3]) and it contained 349 housing units.
Union Township was first settled in the spring of 1835.[4] Union Township was organized in 1837.[5]
According to the 2010 census, the township has a total area of, of which (or 99.59%) is land and (or 0.37%) is water.[3]
The township contains these five cemeteries: Ebenezer, Independent Order of Odd Fellows, Mount Zion, Leedy and Weasaw.