| Official Name: | Marion Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Allen |
| Government Type: | Indiana township |
| Area Total Km2: | 90.35 |
| Area Land Km2: | 89.75 |
| Area Water Km2: | 0.59 |
| Unit Pref: | Imperial |
| Area Water Percent: | 0.66 |
| Population As Of: | 2020 |
| Population Footnotes: | [1] |
| Population Total: | 3838 |
| Population Density Km2: | 43.0 |
| Elevation M: | 245 |
| Elevation Ft: | 804 |
| Coordinates: | 40.9619°N -85.0567°W |
| Postal Code Type: | ZIP codes |
| Postal Code: | 46733, 46745, 46777, 46816, 46819 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 0453602 |
Marion Township is one of 20 townships in Allen County, Indiana, United States. As of the 2010 census, its population was 3,858.[2]
In September, 1834, the Commissioners of Allen County created Root Township, which embraced all of present-day Marion Township, as well as a portion of present-day Adams County. Adams County was created on February 7, 1835, leaving only a portion of Root Township still in Allen County. In August, 1835, this remainder of Root Township was reorganized and renamed Marion Township.[3]
According to the United States Census Bureau, Marion Township covers an area of 90.35sqkm; of this, 89.75sqkm is land and 0.59sqkm, or 0.66 percent, is water.[2]
(This list is based in part on USGS data and may include former settlements.)
The township contains the following cemeteries: Antioch Lutheran, Bethel Baptist (defunct), Coleman family (defunct), Emmanuel Lutheran, Hall (disappeared), Morton family (defunct), Poe/Williamsport, St. John's Lutheran (defunct), St. Joseph Hessen Cassel Roman Catholic, St. Paul's Lutheran (defunct), and Thompson family (defunct).