| Official Name: | Union Township |
| Settlement Type: | Township |
| Mapsize: | 290px |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Montgomery |
| Government Type: | Indiana township |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 111.88 |
| Area Land Sq Mi: | 111.58 |
| Area Water Sq Mi: | 0.3 |
| Area Water Percent: | 0.27 |
| Population As Of: | 2020 |
| Population Total: | 25087 |
| Population Density Sq Mi: | auto |
| Elevation Footnotes: | [1] |
| Elevation M: | 238 |
| Elevation Ft: | 781 |
| Coordinates: | 40.0375°N -86.8975°W |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Postal Code Type: | ZIP codes |
| Postal Code: | 47933, 47965, 47968 |
| Area Code: | 765 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 453926 |
Union Township is one of eleven townships in Montgomery County, Indiana, United States. As of the 2020 census, its population was 25,087 (up from 24,587 at 2010[2]) and it contained 10,949 housing units.[3] Wabash College is located in Crawfordsville in this township.
According to the 2010 census, the township has a total area of, of which (or 99.73%) is land and (or 0.27%) is water.[2]
(This list is based on USGS data and may include former settlements.)
The township contains these nineteen cemeteries: Ben Hur, Breaks, Calvary, Coons, Finley Chapel, Galey, Harshbarger, Hutton, Independent Order of Odd Fellows, Lutheran, Michael, Nutt, Oak Hill, Oldtown, Sidener, Stover, Weir, Wilhite and Wilson.