| 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: | Johnson |
| Government Type: | Indiana township |
| Area Total Sq Mi: | 36.15 |
| Area Land Sq Mi: | 36.14 |
| Area Water Sq Mi: | 0.01 |
| Population As Of: | 2020 |
| Population Footnotes: | [1] |
| Population Total: | 2831 |
| Population Density Sq Mi: | 74.4 |
| Elevation Footnotes: | [2] |
| Elevation M: | 248 |
| Elevation Ft: | 814 |
| Coordinates: | 39.4839°N -86.1914°W |
| Blank Name: | FIPS code |
| Blank Info: | 18-77390[3] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 453921 |
Union Township was one of nine townships in Johnson County, Indiana. As of the 2010 census, its population was 2,689 and it contained 1,068 housing units.[4]
As of January 1, 2022, Franklin, Union, and Needham townships were merged into a single entity known as Franklin-Union-Needham Township ("FUN").[5]
Union Township was organized in 1830.[6]
According to the 2010 census, the township has a total area of, of which (or 99.97%) is land and (or 0.03%) is water.[4]