| Official Name: | Jefferson Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | Cass |
| Government Type: | Indiana township |
| Area Total Km2: | 93.51 |
| Area Land Km2: | 92.62 |
| Area Water Km2: | 0.89 |
| Area Total Sq Mi: | 36.1 |
| Area Land Sq Mi: | 35.76 |
| Area Water Sq Mi: | 0.35 |
| Population As Of: | 2020 |
| Population Footnotes: | [1] |
| Population Total: | 1297 |
| Population Density Km2: | auto |
| Elevation Footnotes: | [2] |
| Elevation M: | 216 |
| Elevation Ft: | 709 |
| Coordinates: | 40.7789°N -86.525°W |
| Blank Name: | FIPS code |
| Blank Info: | 18-37890[3] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 453481 |
Jefferson Township is one of fourteen townships in Cass County, Indiana. As of the 2020 census, its population was 1,297 (down from 1,452 at 2010[4]) and contained 580 housing units.
Jefferson Township was organized in 1831.[5] It was named for Thomas Jefferson, third President of the United States.[6]
Jefferson Township covers an area of ; (0.97 percent) of this is water. Lake Cicott is in this township.
The township contains two cemeteries: Davis and Zion. Davis Cemetery is located a mile east of Burnettsville and a half mile east of the White County-Cass county line, and is commonly referred to as the Davis Cemetery Burnettsville in obituaries. It was also known as the Winegardner Cemetery.